Hello Monster

Hello Monster (Korean: 너를 기억해; lit. I Remember You) is a South Korean television series starring Seo In-guk, Jang Na-ra, Choi Won-young, and Park Bo-gum.^[2][3][4] It aired on KBS2 from June 22 to August 11, 2015 every Monday and Tuesday at 21:55 for 16 episodes.^[5][6]

Hello Monster
Promotional poster
Also known as	I Remember You[1]
Genre	Thriller Mystery Police procedural
Created by	KBS Drama Division
Written by	Kwon Ki-young
Directed by	Noh Sang-hoon Kim Jin-won
Starring	Seo In-guk Jang Na-ra Choi Won-young Park Bo-gum
Composer	Lee Pil-ho
Country of origin	South Korea
Original language	Korean
No. of episodes	16
Production
Executive producers	Choi Jin-hee Park Ji-young Jung Sung-hyo
Producers	Hwang Ui-kyung Lee Na-jung Park Woo-ram
Cinematography	Park Sung Kim Kyung-ho
Editor	Kim Young-joo
Running time	70 minutes
Production company	CJ E&M
Original release
Network	KBS2
Release	June 22 (2015-06-22) – August 11, 2015 (2015-08-11)

Korean name
Hangul	너를 기억해
Hanja	너를 記憶해
Revised Romanization	Neoreul gieokae
McCune–Reischauer	Nŏrŭl kiŏkhae

Audiences and critics alike praised Park Bo-gum's performance and won him Best Supporting Actor and Popularity Award at the 29th KBS Drama Awards.

Synopsis

Genius profiler Lee Hyun, returns home to Korea after something from a case he has been sent triggers a memory he thought he had lost forever. Unbeknownst to him, one of his team members, Detective Cha Ji-an, has been investigating him for some time. She is aware that his father was murdered and his brother disappeared under mysterious circumstances involving a criminal named Lee Joon Young whom they both want found and incarcerated. Each seeks to unravel the other, unaware that they've been drawn into a dangerous game of cat and mouse by a master player and that both truth and evil are closer and far more twisted than they think.

Cast

Main

• Seo In-guk as Lee Hyun / David Lee
  • Hong Hyun-taek^[7] as young Lee Hyun

Lee Hyun was a "strange child" who caught the attention of his father, a police inspector, who later confined him in a small room to prevent him from breeding criminal thoughts. An intelligent child, he later studies abroad and becomes a reputed professor. Strangely, he loses his childhood memories, and a series of events lead him to return to South Korea. There he tries to solve numerous murder cases that seem to be linked to one another in order to find his long-lost little brother, whom he presumed to be the serial killer.

• Jang Na-ra as Cha Ji-an
  • Park Ji-so as young Cha Ji-an

Cha Ji-an's father mysteriously disappeared together with Lee Joon-young, a convicted prisoner who was said to have escaped from confinement. She becomes a police inspector and meets Lee Hyun, the boy she has been stalking since her childhood. Their similar circumstances lead them together as they work to solve criminal cases.

• Choi Won-young as Lee Joon-ho / Lee Joon-young
  • Doh Kyung-soo as teen Lee Joon-young

Born as a result of rape, Joon-young was neglected as a child. He soon bred murderous thoughts and became a murderer who eventually escaped from prison. 20 years later, he returned with the identity of Lee Joon-ho. His main personality trait throughout the series was depicted as someone who doesn't understand complexities of human emotions while being well versed in their thoughts. For-example, from his perspective, his returning of Cha Ji-an's father's remains was a good deed despite having killed and framed the guy himself. Knowing how her father ended up 20 years ago made her angry at him but he was sad to see Cha Ji-an being angry and couldn't figure out the reason despite it being very obvious to others.

He doesn't think he ever did anything bad since there was always a justifiable reason for himself.

In his own words, Lee Hyun was the kid he wanted to be while Lee Min was the kid who came to resemble him.

• Park Bo-gum as Jung Sun-ho / Lee Min
  • Hong Eun-taek^[7] as young Lee Min

Lee Min shared a close relationship with Lee Hyun as a child and often confided his darkest secrets to him. He feels neglected later on as he was under the misconception that he had been abandoned by his brother after their father was murdered. He later appears nearly 20 years later using the name Jung Sun-ho.

Supporting

• Lee Chun-hee as Kang Eun-hyuk

The leader of the special investigator team and the son of the police commissioner.

• Min Sung-wook as Son Myung-woo

Special investigator member and senior of Cha Ji-an. He is cynical and is annoyed by Lee Hyun's attitude.

• Kim Jae-young as Min Seung-joo

The youngest member of the team. He is a bright young man who is cheerful.

• Son Seung-won as Choi Eun-bok

Special investigator team member. He is a slightly quiet person. Unbeknownst to the team, he is one of the kids that Lee Joon-young saved from his hellish childhood life.

• Im Ji-eun as Hyun Ji-soo

Planning director of the investigation team and Lee Hyun's adoptive mother.

• Nam Kyung-eup as Kang Seok-joo

Police commissioner and father of Kang Eun-hyuk

• Lee Bom as Joon-ho's mother

She was raped and gave birth to Lee Joon-ho.

Guest and cameo appearances

• Shin Dong-mi as Yang Eun-jung

Cha Ji-an's aunt.

• Jun Kwang-ryul as Lee Joong-min

Lee Hyun's and Min's father.

• Tae In-ho as Yang Seung-hoon

A chaebol, who is a serial killer and Jung Sun-ho's client

• Choi Deok-moon as Na Bong-sung

Lee Hyun's indebted friend, who Hyun always ask a favor from

• Lee So-yoon
• Yoo Hyung-kwan as Yang Jin-seok
• Park Gun-rak
• Lee Won-jae
• Ha In-hwan
• Bae Ki-bum
• Han Young-kwan
• Yoon Dong-young
• Dong Yoon-seok
• Song Ui-joon
• Shin Jae-ha as Park Dae-young (episode 5)

A serial killer whose motive is to avenge his mother and little sister's death

• Kim Jong-gu as Shin Jang-ho
• Jung Jong-ryul
• Kim Kyu-chul as Park Young-chul (episode 5)

Park Dae-young's father, a prisoner who was accused of killing his wife and daughter

• Seo Young-joo as Lee Jung-ha (episodes 6–7)

Lee Han-chul's son

• Yoo Se-hyung as Lee Jin-woo

Lee Jung-ha's friend. His father was murdered by Lee Han-chul.

• Ryu Sung-hyun as Lee Han-chul (episodes 6–7)

Lee Jung-ha's father, a serial killer and rapist

• Lim Seong-eon as Ji Hyun-sook (episodes 9–10)

Myung-woo's blind date, who later was abducted by a serial killer and his girlfriend

• Ko Kyu-pil as Park Soo-yong
• Park Jae-woong as Do Jae-shik (episode 10)

A serial killer

• Lee El as Kang Sung-eun (episodes 9–10)

Do Jae-shik's girlfriend and accomplice

• Kim Min-kyung
• Hwang Min-ho

Production

The first script reading took place in the end of April 2015 at the annex of KBS in Yeouido, Seoul, South Korea.^[8]

Reception

Critical response

Despite the show's lackluster ratings, audiences and critics alike praised Park Bo-gum's performance and won him Best Supporting Actor and Popularity Award at the 29th KBS Drama Awards.^[9] In 2025, in a career retrospective for Park, Gulf News stated that Park's performance in the series was "his best role yet in a stellar career... proving his ability to shape-shift into what the role demanded—even if the show wasn’t always a hit, Bo-gum always was."^[10]

Viewership

In this table, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.

Ep.	Original broadcast date	Title	Average audience share
			TNmS[11]		AGB Nielsen[12]
			Nationwide	Seoul	Nationwide	Seoul
1	June 22, 2015	Every Child's Story Begins with Their Parents	5.6%	5.4%	4.7%	4.7%
2	June 23, 2015	Hello, Monster	5.6%	5.8%	4.7%	4.5%
3	June 29, 2015	Thou Shall Not Kill, But...	5.2%	5.8%	4.7%	4.8%
4	June 30, 2015	The Suspect, Lee Hyun	4.9%	5.0%	4.0%	4.1%
5	July 6, 2015	Borne Back Ceaselessly into the Past	4.6%	4.8%	4.6%	4.8%
6	July 7, 2015	The Blood of a Murderer	5.4%	5.5%	4.8%	4.9%
7	July 13, 2015	Let's Be Partners?	5.0%	5.2%	4.7%	4.5%
8	July 14, 2015	Remember Me	4.2%	4.7%	4.6%	5.0%
9	July 20, 2015	Stalker S	4.5%	4.6%	4.9%	5.1%
10	July 21, 2015	Find Me	4.6%	4.7%	5.0%	5.0%
11	July 27, 2015	Birth of a Monster	4.7%	5.1%	4.8%	4.9%
12	July 28, 2015	If I Had to Kill Somebody...	4.6%	5.5%	5.0%	5.2%
13	August 3, 2015	What Choice Would You Make?	4.1%	4.1%	4.5%	4.7%
14	August 4, 2015	Lee Joon-young's Room	4.7%	4.9%	5.3%	5.4%
15	August 10, 2015	Is a Happy Ending Possible?	4.6%	5.0%	4.5%	4.9%
16	August 11, 2015	I Remember You	4.3%	4.3%	5.1%	5.3%
Average			4.8%	5.0%	4.7%	4.9%

• The drama aired with English subtitles on KBS World a week after its initial broadcast in Korea.

Awards and nominations

Year	Award	Category	Recipient	Result	Ref.
2015	8th Korea Drama Awards	Top Excellence Award, Actress	Jang Na-ra	Nominated
		Excellence Award, Actor	Seo In-guk	Nominated
		Best Screenplay	Kwon Ki-young	Nominated
	4th APAN Star Awards	Best New Actor	Park Bo-gum	Nominated
	29th KBS Drama Awards	Best Supporting Actor		Won
		Popularity Award, Actor		Won
		Excellence Award, Actor in a Mini-series	Seo In-guk	Nominated
		Excellence Award, Actress in a Mini-series	Jang Na-ra	Nominated

International broadcast

Country	Network(s)/Station(s)	Series premiere	Title
Malaysia	TV2	September 2 - October 7, 2018 (Sunday - Tuesday, 20:30 - 21:30);[13] December 23, 2018 - ongoing (Sunday - Tuesday, 20:30 - 21:30) [reaired]	I Remember You