Those Who Cross the Line

Those Who Cross the Line (Korean: 선을 넘는 녀석들) is a South Korean television entertainment program and televised on MBC.

Those Who Cross the Line
Also known as	On the Border The Guys Who Cross the Line
Hangul	선을 넘는 녀석들
Revised Romanization	Seon-eul Neomneun Nyeoseokdeul
McCune–Reischauer	Sŏnŭl nŏmnŭn nyŏsŏktŭl
Genre	Reality television Travel documentary
Starring	Various artistes
Country of origin	South Korea
Original language	Korean
No. of seasons	4
No. of episodes	125 (list of episodes)
Production
Production locations	Season 1: Mexico, United States, France, Germany, Jordan, Israel-Palestine, Spain, Gibraltar, Morocco, Portugal, Italy, Slovenia Season 2: South Korea, Japan Season 3: South Korea, Russia, China, Saipan, Tinian Season 4: South Korea
Camera setup	Multi-camera
Running time	60–90 minutes
Production company	MBC
Original release
Network	MBC TV
Release	30 March 2018 (2018-03-30) – 22 December 2021 (2021-12-22)

Season 1 was aired every Friday, starting 30 March and ending on 14 September 2018.^[1]

Season 2 was aired every Saturday, starting 16 February and ending on 23 March 2019.^[2]

Season 3 was aired every Sunday, starting 18 August 2019 and ending on 13 December 2020.^[3]

Season 4 was aired every Sunday, starting 25 April 2021 with a new master and another guest as X.^[4] It was changed to Wednesday as of 1 December 2021^[5] and the show ended on 22 December 2021.^[6]

Overview

Season 1

The program is a 20-episode series program that compares and contrasts different histories, cultures, and arts as if they resemble the two nations facing the border. It is a new concept that takes away from everyday life that can only be felt locally to a unique history.^[1] The program was originally a 16 episodes series but got extended due to its popularity.^[7]

Season 2

The second season, Those who cross the line - Korean Peninsula (Korean: 선을 넘는 녀석들 - 한반도편; RR: Seon-eul Neomneun Nyeoseogdeul - Hanbandopyeon), is a 6-episode series program that compares and contrasts on the history of Korean Peninsula and to commemorate the 100th anniversary of March 1st Movement and Provisional Government.^[2] This second season is based on the success of the first season^[8] and Seol Min-seok's wishes to visit/cross the Military Demarcation Line (MDL) as mentioned in the opening premier of the Season 2 when the five cast members met.^[9] Before visiting the MDL, the cast will learn about the history of Korean Peninsula, particularly on the topics on "Those who tried to protect their borders" from history teacher, Seol Min-seok and invited guests.^[10]

Season 3

The third season, Those who cross the line - Returns (Korean: 선을 넘는 녀석들 리턴즈; RR: Seon-eul Neomneun Nyeoseogdeul-liteonjeu), is the continuation with the success of the Season 2 and is to visit the hidden historical sites all over South Korea. The excitement is the journey to find the true story that cannot be learned from history books. Furthermore, it is expected that it will make a meaningful move that draws together the stories of yesterday, today, and tomorrow that we have not known yet.^[3] In addition, invited guests will visit each historical site to make the Korean history exploration more enriching and enjoyable.^[11]

Season 4

The fourth season, Those who cross the line - Master X (Korean: 선을 넘는 녀석들 : 마스터-X; RR: Seon-eul Neomneun Nyeoseogdeul-ma-seu-teo-X), is a comeback with an expanded version that crosses the history as well as various 'line of knowledge'. A new world of knowledge to be with the best masters in Korea! Who is the unknown Master X who will cross the line of knowledge every week, such as History vs Science, History vs Psychology and History vs Art.^[12]

Airtime

Season	Airdate	Broadcast Start Time (KST)
1	30 March – 14 September 2018	Fridays at 9:50 pm
2	16 February – 23 March 2019	Part 1	Saturdays at 6:25 pm
		Part 2	Saturdays at 7:10 pm
3	18 August 2019 – 13 December 2020	Part 1	Sundays at 9:05 pm
		Part 2	Sundays at 9:50 pm
4	25 April – 21 November 2021	Part 1	Sundays at 9:10 pm
		Part 2	Sundays at 9:50 pm
	1 – 22 December 2021	Wednesdays at 9:00 pm[5]

Cast

Season 1

Name	Episode	Ref/Notes
Kim Gu-ra	Ep. 1 – 20	[1]
Seol Min-seok	Ep. 1 – 20
Lee Si-young	Ep. 1 – 16	Lee exited from the show after episode 16, as the original filming of the program was for 16 episodes, and she is filming for her new show. Due to the popularity, the program got extended as explained in episode 17 by Kim Gu-ra.

List of cast (season 1) International Border

Season 2

Name	Episode	Ref/Notes
Jun Hyun-moo	Ep. 1 – 6	[2][13][14]
Seol Min-seok	Ep. 1 – 6
Moon Geun-young	Ep. 1 – 6
Yoo Byung-jae	Ep. 1 – 6
Daniel Lindemann	Ep. 1 – 6

List of cast (season 2) Korean Peninsula

Season 3

Name	Episode	Ref/Notes
Jun Hyun-moo	Ep. 1 – 67	[3]
Yoo Byung-jae	Ep. 1 – 67
Kim Jong-min (Koyote)	Ep. 1 – 67
Seol Min-seok	Ep. 1 – 67

List of cast (season 3) Returns

Season 4

Name	Episode	Role	Ref/Notes
Jun Hyun-moo	Ep. 1 – 32	Host	[4][6]
Yoo Byung-jae	Ep. 1 – 32
Kim Jong-min (Koyote)	Ep. 1 – 32
Shim Yong-hwan	Ep. 1 – 32	History Master
Kim Kyung-il	Ep. 1 – 32	Psychology Master
Kim Sang-wook	Ep. 1 – 32	Science Master

List of cast (season 4) Master X

Episodes

Season 1

Episode #	Trip #	Original Airdate Date	Location	Guests	Ref/Notes
1 – 4	1	30 March 2018 6 April 2018 13 April 2018 20 April 2018	Mexico City & Tijuana (Mexico) (30 March - 20 April) + San Diego (United States) (20 April)	Tyler Rasch Christian Burgos Yoo Byung-jae	[15]
—	No broadcast on 27 April due to special broadcast of Inter Korea Summit [16]
5 – 8	2	4 May 2018 11 May 2018 18 May 2018 25 May 2018	Paris & Strasbourg (France) (4 May – 18 May) + Baden-Württemberg & Berlin (Germany) (18 May – 25 May)	Cha Eun-woo (Astro) Daniel Lindemann Yoo Byung-jae	[17]
—	No broadcast on 1 June due to International Friendly soccer match between South Korea & Bosnia-Herzegovina [18]
9 – 12	3	8 June 2018 22 June 2018 29 June 2018 13 July 2018	Amman, Jerash, Ma'in Hot Springs & Petra (Jordan) (8 June, 22 June) + Jerusalem & Dead Sea (Israel-Palestine) (29 June, 13 July)	Minho (Shinee) MC Gree	[19] No broadcast on 15 June[20] and 6 July[21] due to 2018 FIFA World Cup matches Live telecast
13 – 16	4	20 July 2018 27 July 2018 3 August 2018 10 August 2018	Barcelona (Spain) (20 July - 3 August) + Gibraltar (British Overseas Territories) (3 August) + Morocco & Portugal (10 August)	P.O (Block B) Lee Su-hyun (AKMU)	[22] Lee Si-young's last trip
17 – 20	5	17 August 2018 24 August 2018 7 September 2018 14 September 2018	Florence, Venice & Trieste (Italy) (17 – 24 August, 7 – 14 September) + Lake Bled (Slovenia) (14 September)	Solbi Yura (Girl's Day) Yoo Byung-jae	[23] No broadcast on 31 August due to 2018 Asian Games live telecast.

List of episodes (season 1) International Border

Season 2

Episode #	Original Airdate Date	Location/Place visited	Historical Events	Special Guest(s)	Ref/Notes
1	16 February 2019	Ganghwa Island Gwangseongbo Fortress (광성보) (江華 廣城堡) Samrang Fortress (강화 삼랑성) (江華 三郞城) Ganghwa Peace Observatory (강화평화전망대) (江华和平观察站)	1871 Korean Campaign French Campaign against Korea, 1866 1884 Gapsin Coup	—	[24]
2	23 February 2019	Ganghwa County Yeunsangun's house of exile Gyodong Island	First Literati Purge of 1498 Second Literati Purge of 1504 Jungjong coup in 1506	Kim Young-ok	Kim Young-ok talk about her personal experiences in Korea under Japanese rule, Korean War and family reunion with her eldest brother (North Korean) whom she has not seen for 50 years (in 2000) since the start of Korean War.[25]
		Jeju Island Samseonghyeol Shrine (삼성혈) (三姓穴) Yeonbukjeong (연북정) (戀北亭) Jocheon Monument Street (조천비석거리) (朝天石碑街)	Donghak Peasant Revolution	—	All the five cast members are together for the first time since the premier opening of the show.
3	2 March 2019	Jeju Island Mount Songak (송악산) Japanese-made Cave Encampment at Sesaloleum (제주 셋알오름 일제 동굴진지) Alddreu Airfield (알뜨르 비행장) Socotra Rock (이어도) (離於島) Mount Sanbangsan (산방산) (山房山) Jeongbang Waterfall (정방폭포) (正房瀑布)	Beopjeongsa Movement Jeju uprising Hendrick Hamel in the Joseon Korea	Go Doo-shim
4	9 March 2019	Jeju Island Jeongbang Waterfall (정방폭포) (正房瀑布) Yeongmowon (영모원) (慰靈壇)	Jeju uprising	—
		Tokyo, Japan The Classic house at Asakasa Prince Hibiya Park Ichigaya Prison (Commemorative Tombstone)	Triple Intervention February 8 Declaration of Independence Sakuradamon Incident (1932) Kantō Massacre	Choi Hee-seo
5	16 March 2019	Tokyo, Japan Tokyo Station	Five Eulsa Traitors Seven Jeongmi Traitors 8 pro-Japanese Traitors	—
		Kyoto, Japan Koryo Museum of Art Doshisha University - Yun Dong-ju Memorial Yodo River	Era of Imperialistic Cultural Cleansing	—
		South Korea Cheorwon County	—	—
6	23 March 2019	Cheorwon County Igrl-ri Labor Party Headquarter (Former North Korea building) Baengmagoji Station Korean Demilitarized Zone Civilian Control Line Southern Limit Line Arrow Head Ridge Guard Post Military Demarcation Line	Korean War Battle of Inchon Hungnam evacuation Third Battle of Seoul Battle of Arrow Head Ridge	Kim Ji-yoon (International Political Specialist)
Episode #	Original Airdate Date	Location/Place visited	Historical Events	Special Guest(s)	Ref/Notes

List of episodes (season 2) Korean Peninsula

Season 3

Episode #	Original Airdate Date	Location/Place visited/Event	Special Guest(s)	Ref/Notes
1	18 August	Seoul Gyeongbokgung Palace Changdeokgung Palace Deoksugung Palace (Jungmyeongjeon)	Choi Hee-seo Yuji Hosaka	[26]
2	25 August	Busan Taejongdae Dongnae-eupseong Imjin Warran History Museum at Suan Station of Busan Metro Line 4 Yongdusan Park (Busan Tower) Joseon Tongsinsa	Cho Jin-woong Sandeul	[27]
3	1 September	Seoul History tour Chōsen Shrine Former residence of Resident-General of Korea Mitsukoshi Department Store Gyeonggyojang	Choi Hee-seo	[28]
4	8 September	History of Silla (Gyeongju, North Gyeongsang Province) Gyeongju National Museum Tomb of King Muyeol Tomb of General Kim Yu-sin Hwangnyong Temple Tomb of Munmu of Silla Gameunsaji Temple Gyeongju National Research Institute of Cultural Heritage	Moon Geun-young	[29]
5	15 September			[30]
			Solbi	[31]
6	22 September	Tongyeong, South Gyeongsang Province Samdo navy Sebyeonggwan Hansan Island	Kim Myung-min Kim In-kwon	[32]
7	29 September	Imjin War (Jinju, South Gyeongsang Province) Jinjuseong Fortress Namhae Yi Sunshin Sunguk Park	Lee Jin-hyuk (UP10TION)	[33]
8	6 October	Baekje Historic Areas (Gongju & Buyeo County, South Chungcheong Province and Iksan, North Jeolla Province) Songsan-ri Ancient Tombs Buyeo Jeongnimsaji Buyeo National Museum (ft. Gilt-bronze Incense Burner of Baekje and Geumdong Guanyin Bodhisattva statue) Baekje Cultural Land Nakhwaam Stone Mireuksaji Stone Pagoda Iksan Wanggung-ri ruins	Park Chan-ho Mijoo (Lovelyz)	[34]
9	13 October		Park Chan-ho Han Sun-hwa	[35]
10	20 October	Panmunjom Events and history of Joint Security Area	Lee Jin-hyuk (UP10TION) Park Yeon-kyung	[36]
11	27 October			[37]
12	3 November	The True Record of the Joseon Dynasty (Odaesan, Pyeongchang) The Annals of the Joseon Dynasty Woljeongsa Temple Sangwonsa Temple	Jeon In-hwa	[38]
13	10 November	Trans–Siberian Railway (Vladivostok, Russia) Ussuriysk Oversea Independence Movement in Vladivostok	Choi Hee-seo	[39]
14	17 November			[40]
15	24 November	Danjong of Joseon (Yeongwol, Gangwon Province) Yeongwol Seondol King Danjong's residence during exile Jagyuru and Gwanpungheon Tomb of King Danjong Changjeolsa Temple	Jeong Yu-mi	[41]
16	1 December			[42]
17	8 December	Korean Independence Movement (Shanghai, China) Provisional Government of the Republic of Korea's Temporary Office Building Yun Bong-gil - Hongkew Park Bombing Kim Gu's Independence Movement in China	Han Go-eun Yoon Joo-bin	[43]
18	15 December		Han Go-eun Yoon Joo-bin Kim Yong-man (Kim Gu's great grandson)
19	22 December
		Confucian scholars of Andong (Andong, North Gyeongsang Province) Dosan Seowon	Jeong Yu-mi	[44]
—	No new episode on 29 December due to 2019 MBC Entertainment Awards live telecast

List of episodes (season 3) Returns (2019)

Episode #	Original Airdate Date	Location/Place visited/Event	Special Guest(s)	Ref/Notes
20	5 January	Confucian scholars of Andong (Andong, North Gyeongsang Province) The Korean Studies Institute Byeongsanseowon Confucian Academy Yi Yuksa (ft. Poetic work during Korea Independence Movement)	Jeong Yu-mi	[45]
21	12 January		Jeong Yu-mi Lee Ok-bi	[46]
		Busan Exploration Special Dong-A University Seokdang Museum (ft. Relics excavated from Yangsan Geumjoong) United Nations Memorial Cemetery Yeongdo Bridge 40-step stairway (ft. the historical stairway and cultural centre)	Song Hae Yook Joong-wan
22	19 January			[47]
—	No new episode on 26 January due to New Year Special 2020 Songan Concert telecast.
23	2 February	Sejong Science Special (Seoul) National Palace Museum of Korea	Kim Sang-wook	[48]
24	9 February			[49]
25	16 February	Provisional Government of the Republic of Korea (Chongqing, China) Yi Dong-nyeong - (ft. Yi Dong-nyeong's residence & the footsteps of the 80th anniversary of the Korean Liberation Army)	Han Go-eun	[50]
26	23 February			[51]
27	1 March	March 1st Movement Special (Seoul) Independence movement theme at Anguk Station Boseongsa (ft. Declaration of Independence) Cheondogyo Central Bridge Tapgol Park Seodaemun Prison History Hall	Jeong Yu-mi	[52]
28	8 March			[53]
		Sejong Hangul Special (Seoul) National Hangeul Museum MBC Sangam-dong Studio (History Golden Bell) Ju Si-gyeong - Standardizing Korean Language Hangul Society Incident	Ddotty	[54]
29	15 March			[55]
30	22 March	Qing invasion of Joseon (Seoul) Changuimun Namhansanseong Samjeondo Monument	Kim Kang-hoon	[56]
31	29 March			[57]
32	5 April	Sukjong of Joseon (Seoul) Seooreung - Royal tomb of the Joseon Dynasty (ft. the tomb of Gyeongneung and Myeongneung) Land Palace	Jeong Yu-mi	[58]
33	12 April
34	19 April	April Revolution Unification Education Center April 19 National Democratic Cemetery Namsan Literature House Former Namyeong-dong's Anti-Communist Office	Kim In-kwon	[59]
35	26 April
		Joseon Dynasty Special - Yeongjo Exploration Changgyeonggung (ft. Honghwamun (main gate) and Munjeongjeon (council hall)) Jangchungdan Park - Supyogyo bridge	Rowoon (SF9) Kim Kang-hoon	[60]
36	3 May
37	10 May	Joseon Dynasty Special - Jeongjo Exploration Changdeokgung (ft. Buyongji and Kyujanggak)
		Joseon Dynasty Special - The 1795 Eight Days Parade Hwaseong Fortress - Janganmun (North gate) Hwaseong Haenggung Palace (ft. Sinpoongru, Naknamheon and Bongsudang)	Kim Se-jeong	[61]
38	17 May		Kim Sang-wook	[62]
			Kim Se-jeong Park Yeong-tak	[63]
39	24 May	Dasan Ecological Park Jeong Yakyong
		Donghak Peasant Revolution	Jeong Yu-mi Kim Ho-jung	[64]
40	31 May
41	7 June	UNESCO World Heritage Special Jongmyo Shrine Heojun Museum Gyeojangbawi Rock	Jun Kwang-ryul	[65]
42	14 June
		Special feature of the 70th anniversary of the Korean War Namdaemun Hangang Bridge War Memorial of Korea	Sung Yu-ri	[66]
43	20 June
		Koreans on the battlefield during the Second World War (Saipan) Mount Tapochau	Kim Hye-yoon	[67]
44	27 June
45	5 July	Koreans on the battlefield during the Second World War (Tinian) Sugar King Park Last Japanese Command		[68]
46	12 July	1st Anniversary Special (Ulleungdo & Dokdo)	Jeong Yu-mi	[69]
47	19 July			[70]
48	26 July	Ancient Korean Social Class System Korean Folk Village	Alberto Mondi Shin Ji (Koyote)	[71]
49	2 August
		Ancient Korean Social Class System Seongsu-dong Valley	Kim Se-jeong Park Yeong-tak	[72]
50	9 August	Museum is alive Special Feature National Museum of Korea	Han Ji-hye	[73]
51	16 August	Liberation Day Massacre in Hwaseong, Gyeonggi Province Pro-Japanese	Choi Hee-seo	[74]
52	23 August			[75]
53	30 August	Jeong Mong-ju and Jeong Do-jeon rivalry Yeonju flight Buseoksa Temple Muryangsujeon (Yeongju) The beginning of Joseon	Choi Soo-jong	[76]
54	6 September
55	13 September	Joseon's last rivalry: Gojong and Heungseon Daewongun Conflict between the rich Seokpajeong - villa of Heungseon Daewongun Unhyeongung - former residence of Heungseon Daewongun Gojong's new rival emerged Wongudan	Moon Ga-young	[77]
56	20 September
57	27 September	The Age of Three Kingdom	Choi Soo-jong	[78]
—	No new episode on 4 October due to Chuseok Special program telecast.
58	11 October	Joseon's sovereignty	Jin Se-yeon	[79]
59	18 October	100th Anniversary of the Battle of Cheongsanri	Song Il-gook	[80]
60	25 October
61	1 November	Parallel Theory of Plagues	Jin Tae-hyun	[81]
62	8 November	Finding Sisters Who Have Crossed the Line of Prejudice Gangneung (Shinsaimdang & Heonanseolheon) Hwang Jini	Noh Sa-yeon	[82]
63	15 November			[83]
		Real Men Special Goryeo military regime Sambyeolcho	Jung Tae-woo	[84]
64	22 November			[85]
65	29 November			[86]
66	6 December	Finding the Secret of Modern History 10.26 incident Yeouido Park 12.12 Military Insurrection	Jin Se-yeon	[87]
67	13 December
		There is no country for princesses Princess Deokhye	Park Ha-sun	[88]
Episode #	Original Airdate Date	Location/Place visited/Event	Special Guest(s)	Ref/Notes

List of episodes (season 3) Returns (2020)

Season 4

Episode #	Original Airdate Date	Collaboration	Theme/Location/Place visited/Event	Guest(s)	Ref/Notes
1	25 April 2021	Psychology	Between the Tyrant and the Seonggun – Yeonsan-gun vs Jeongjo Seonjeongneung – Changdeokgung Palace Back Garden of Changdeok Palace – Kyujanggak	Kim Kyung-il	[89]
2	2 May 2021				[90]
3	9 May 2021	Science	The X-Files That Changed the History of the Korean Peninsula Hwajinpo Castle Goseong County (Gangwon Province) – Unification Observatory	Kim Sang-wook	[91]
4	16 May 2021	History	Remembrance of 18 May Chonnam National University Geumnam-ro Former Main Building Gwangju Jeollanam-do Office May 18th National Cemetery	John Alderman Linton	[92]
5	23 May 2021	Psychology	Spy Hongjecheon, Bugaksan & Cheongundae	Kim Kyung-il	[93]
6	30 May 2021		Vengeance Blood Battle Top Secret Project, Silmido Island, Hell's Island Silmido		[94]
7	6 June 2021	Science	Learning Journey No. 1 (Gyeongju - Moonlit Night of Shilla) Gyeongju National Museum Jjoksaem District Cheomseongdae	Kim Sang-wook	[95]
8	13 June 2021	Science & Arts	Find the Science Code! (Kookjung Park - Treasure Hunter Edition) National Museum of Korea		[96]
9	20 June 2021	History & Psychology	Who is this newcomer? Baek Baek Religion Incident Dongducheon	Kim Kyung-il Pyo Chang-won	[97]
10	27 June 2021	History	6.25 Special In Search of Hidden Heroes We Didn't Know Jangseungpo Port Hungnam evacuation UN Memorial Park	Kim Sang-wook	[98]
11	4 July 2021	History & Psychology	"I Can Be No. 1" by Na Hye-seok, who wrote the history of the Joseon first	Shim Yong-hwan Park Jae-yeon	[99]
12	11 July 2021	History & Crime	Korean version of the CSI forensic unit war on crime	Kwon Il-yong	[100]
13	18 July 2021	History & Environment	1 °C warning, the last SOS from the Earth special Gyeongsin Great Famine	Shim Yong-hwan Jo Cheon-ho	[101]
—	No new episode from 25 July to 1 August due to live telecast of Tokyo Olympics.[101]
14	8 August 2021	History & Psychology	Could Be No. 1 Chosun superstar Yoon Shim-deok	Park Jae-yeon	[102]
15	15 August 2021	History	Liberation Day Special: Sohn Ki-jeong, the first Korean gold medalist.	Seo Kyung-duk	[103]
16	22 August 2021	History & Science	Our relics that will overturn the history of the world! "History has been turned upside down"	Shim Yong-hwan Kim Sang-wook	[104]
17	29 August 2021	History & Psychology	Gyeongsul Gukchi Special: Story of pro-Japanese policemen brutality Cheonan Independence Hall	Kim Kyung-il	[105]
18	5 September 2021	History & Science	History of the volcanic eruption of Mt. Baekdu	Kim Sang-wook Shim Yong-hwan	[106]
19	12 September 2021	History & Psychology	Chun Doo-hwan's Samchung re-education camp	Shim Yong-hwan Kim Kyung-il	[107]
—	No new episode on 19 September due to Chuseok special movie telecast.
20	26 September 2021	Classic Literature & Pansori	Lee Mongryong and Seong Chunhyang	Lee Bong-geun Kim Gemma	[108]
21	3 October 2021	History & Drug	History of drugs in Korea	Kim Sang-wook	[109]
22	10 October 2021	History & Science	History of Space Exploration (Go to the Future) Naro Space Center	Kim Sang-wook Shim Chae-kyung	[110]
23	17 October 2021				[111]
		History & Terror	9/11 terror and Osama bin Laden	Park Hyun-do Kim Kyung-il Kim Sang-wook
24	24 October 2021	History & Economics	Let's Play, Economy	Kim Dong-hwan Shim Yong-hwan	[112]
25	31 October 2021	History & Army	Brutality of Deserter Pursuit (DP)	Attorney Park Joon-young	[113]
26	7 November 2021	History & Criminal Psychology	The Age of Assassination	Pyo Chang-won Park Tae-gyun	[114]
27	14 November 2021				[115]
28	21 November 2021	Science & Mystery	UFO & Alien	Kim Sang-wook	[116]
—	Change of broadcast schedule to Wednesday starting 1 December.[5]
29	1 December 2021	History	Joseon Super Heroes - Hong Gil-dong	Kim Gemma Kim Dahyun	[117]
30	8 December 2021	History	Joseon Super Heroes - Jeon Woo-chi		[118]
31	15 December 2021	History	Our Twisted Hero	Song Hyeong-seok Kim Gemma	[119]
32	22 December 2021	History & Psychology	A precious vote that will change the fate of Korea! <Choice 2022>	Pyo Chang-won Lee Ji-sun	[120]
Episode #	Original Airdate Date	Collaboration	Theme/Location/Place visited/Event	Guest(s)	Ref/Notes

List of episodes (season 4) Master X

Ratings

In the ratings below, the highest rating for the show will be in red and the lowest rating for the show will be in blue for each season or year.

Season 1

2018 AGB Nielsen (Nationwide) [121] Episode Broadcast Date 1 30 March 3.3% 2 6 April 4.3% 3 13 April 2.9% 4 20 April 4.2% 5 4 May 4.6% 6 11 May 5.8% 7 18 May 4.6% 8 25 May 4.1% 9 8 June 5.7% 10 22 June 5.6%

2018 AGB Nielsen (Nationwide) [121] Episode Broadcast Date 11 29 June 4.6% 12 13 July 4.1% 13 20 July 4.4% 14 27 July 4.1% 15 3 August 3.3% 16 10 August 3.2% 17 17 August 4.2% 18 24 August 5.2% 19 7 September 5.9% 20 14 September 4.7%

List of ratings (season 1)

Season 2

2019		AGB Nielsen (Nationwide) [122]
Episode	Broadcast Date
1	16 February	6.2%
2	23 February	5.6%
3	2 March	6.5%
4	9 March	6.2%
5	16 March	5.3%
6	23 March	7.8%

List of ratings (season 2)

The show will be aired in two parts. Only the higher rating of the episode will be shown.

Season 3

2019 AGB Nielsen (Nationwide) [123] Episode Broadcast Date 1 18 August 4.4% 2 25 August 2.8% 3 1 September 3.0% 4 8 September 4.6% 5 15 September 4.1% 6 22 September 3.9% 7 29 September 4.5% 8 6 October 4.7% 9 13 October 4.6% 10 20 October 5.5%

2019 AGB Nielsen (Nationwide) [123] Episode Broadcast Date 11 27 October 3.9% 12 3 November 4.8% 13 10 November 4.2% 14 17 November 6.6% 15 24 November 5.6% 16 1 December 6.3% 17 8 December 3.5% 18 15 December 3.0% 19 22 December 3.1%

List of ratings (season 3) 2019

The show will be aired in two parts. Only the higher rating of the episode will be shown.

2020 AGB Nielsen (Nationwide) [123] Episode Broadcast Date 20 5 January 4.2% 21 12 January 3.6% 22 19 January 4.1% 23 2 February 3.8% 24 9 February 3.2% 25 16 February 2.8% 26 23 February 3.0% 27 1 March 3.6% 28 8 March 3.6% 29 15 March 2.9% 30 22 March 4.1% 31 29 March 4.1% 32 5 April 6.2% 33 12 April 5.4% 34 19 April 6.9% 35 26 April 5.8%

2020 AGB Nielsen (Nationwide) [123] Episode Broadcast Date 36 3 May 5.5% 37 10 May 5.7% 38 17 May 5.7% 39 24 May 5.0% 40 31 May 4.2% 41 7 June 4.6% 42 14 June 4.4% 43 21 June 4.6% 44 28 June 4.5% 45 5 July 5.2% 46 12 July 5.4% 47 19 July 4.9% 48 26 July 4.7% 49 2 August 3.5% 50 9 August 4.6% 51 16 August 4.0%

2020 AGB Nielsen (Nationwide) [123] Episode Broadcast Date 52 23 August 5.6% 53 30 August 5.5% 54 6 September 5.3% 55 13 September 6.9% 56 20 September 5.2% 57 27 September 6.0% 58 11 October 4.6% 59 18 October 5.1% 60 25 October 4.6% 61 1 November 5.4% 62 8 November 5.9% 63 15 November 6.0% 64 22 November 6.5% 65 29 November 5.9% 66 6 December 8.6% 67 13 December 7.8%

List of ratings (season 3) 2020

The show will be aired in two parts. Only the higher rating of the episode will be shown.

Season 4

2021 AGB Nielsen (Nationwide) [124] Episode Broadcast Date 1 25 April 3.7% 2 2 May 3.3% 3 9 May 3.9% 4 16 May 4.0% 5 23 May 3.8% 6 30 May 4.2% 7 6 June 5.1% 8 13 June 3.0% 9 20 June 4.0% 10 27 June 2.9% 11 4 July 3.0% 12 11 July 2.8% 13 18 July 3.3% 14 8 August 2.4% 15 15 August 3.2% 16 22 August 3.1%

2021 AGB Nielsen (Nationwide) [124] Episode Broadcast Date 17 29 August 3.3% 18 5 September 4.8% 19 12 September 3.6% 20 26 September 3.1% 21 3 October 3.5% 22 10 October 2.7% 23 17 October 2.7% 24 24 October 2.9% 25 31 October 3.3% 26 7 November 2.6% 27 14 November 3.1% 28 21 November 2.6% 29 1 December 3.1% 30 8 December 2.7% 31 15 December 2.4% 32 22 December 2.1%

List of ratings (season 4)

The show will be aired in two parts. Only the higher rating of the episode will be shown.

Awards and nominations

Year	Award	Category	Recipient	Result	Ref.
2018	18th MBC Entertainment Awards	Grand Prize (Daesang)	Kim Gu-ra	Nominated	[125]
		Entertainer of the Year Award		Won
		Top Excellence Award, Variety Category (Female)	Lee Si-young	Nominated
		Best Entertainer Award (variety)	Yoo Byung-jae	Won
2019	19th MBC Entertainment Awards	Program of the Year	Those Who Cross the Line - Returns	Nominated	[126]
		Excellence Award, Variety Category (Male)	Yoo Byung-jae	Won
			Kim Jong-min	Nominated
		Excellence Award, Variety Category (Female)	Moon Geun-young	Nominated
		Special Award, Variety	Seol Min-seok	Won
		Entertainer of the Year	Jun Hyun-moo	Won
2020	20th MBC Entertainment Awards	Program of the Year	Those Who Cross the Line - Returns	Nominated	[127]
		Excellence Award, Music/Talk Category (Male)	Kim Jong-min	Won
		Rookie Award, Variety Category (Male)	Kim Kang-hoon	Won
2021	21st MBC Entertainment Awards	Entertainer of the Year	Jun Hyun-moo	Won	[128]
		Best Entertainer Award	Yoo Byung-jae	Won
		Popularity Award	Kim Jong-min	Won

Controversy

Season 1

Jordanian Image Mistake

On 11 June 2018, the production crew of MBC "선을 넘는 녀석들" wrote in the official Instagram that some Jordanian-Israel-Palestine editions broadcast on Friday, 8 June, have pointed out that "the part that used the image of Muhammad as a prophet of Islam and the part that used the rock dome together with the flag of a certain country". The production crew has issued an official apology, in both Korean and English version, for telling people of particular religions and views.^[129]

Season 3

Seol Min-seok's plagiarism of his master's thesis

On 30 December 2020, there was a report that Seol Min-seok's thesis on 'A Study on the Ideological Controversy Appearing in Textbooks of Modern and Contemporary Korean History' for which he received his master's degree at the Yonsei University Graduate School of Education in 2010 was 52% plagiarised. Seol admit that in his research in writing the thesis, he neglected citations and footnotes in the process of referencing other papers. Due to the plagiarism allegation, Seol resigned from all the programs he was cast in^[130][131] and MBC decided to end season 3 of the program to reorganise.^[132]