A man and a woman who were each other's first loves during childhood reunite years later as adults.
In his childhood, Yoon Na-moo was a seemingly quiet and mysterious boy whose father was a psychopath serial killer. He meets his polar opposite in Gil Nak-won, a daughter of a popular actress. Through Nak-won's persistence, pure and loving nature towards Na-moo, Na-moo falls into a reciprocated love. But, when Na-moo's father Yoon Hee-jae, a man who has a twisted affection for his son, murders Nak-won's parents, their short love comes to an end.
Years later, Gil Nak-won is now Han Jae-yi, an aspiring actress (like her mother) who always tries to have a good outlook on life, but also has a panic disorder from her traumatic past. Yoon Na-moo is now Chae Do-jin, a rookie detective who wishes to atone for his father's sins. These two would-be lovers have held on to the precious memories of when they were together but, connected by a tragic fate they must try to overcome the stigma and hardships they will face.[4]
A rookie detective who graduated from police university at the top of his class. He has never forgotten his first and only love, Nak-won, for whom he felt guilty since his father killed her parents. He later became Jae-yi's boyfriend.
A woman with a posttraumatic stress disorder who dreams of becoming an actress like her mother, and though she has suffered greatly, she overcomes it and vows to live well. She never blamed Do-jin despite him being the son of her parents' killer. She eventually becomes Do-jin's girlfriend.
Chae Do-jin's father. A psychopathic serial killer who gives twisted affection to his son and shows no remorse. He murdered Jae-yi's parents and countless other people. After Do-jin called the police, he was arrested and sentenced to death after the court found him guilty of twelve murders. He later escaped from prison and commit a few more crimes (including two murders), and tries to mould Do-jin into a killer by kidnapping and killing Jae-yi, but he failed and Do-jin arrested him.
A prosecutor and Han Jae-yi's adopted brother, who cares for his sister. He is wary and distrusting of Chae Do-jin since Do-jin was the son of his foster parents' killer. It was revealed that he was the murderer of his parents' killer but he was acquitted due to his extremely young age and it was a killing done out of self-defence. He eventually trusts Do-jin, and in the finale episode, he approves his sister's relationship with Do-jin.
Chae Do-jin's elder brother. He has a violent personality and tries to follow his psychopathic father's footsteps, and he felt jealous towards Do-jin for being his father's most favourite child, which was compounded by the hatred he felt against Do-jin for reporting their father to the police.
Chae Do-jin's step-mother. She was Hee-jae's wife from a fourth marriage, and she treats Do-jin as her own child. She repeatedly tries to open up to Hyun-moo and accept him, but Hyun-moo rejects her kindness, until much later in the series when Hyun-moo finally opens up to her.
Chae Do-jin's younger step-sister. She was the daughter of Ok-hee and another man (prior to her marriage to Hee-jae), but she still regards Do-jin and Hyun-moo as her brothers despite having no blood relations to them.
The sole female police detective of Do-jin's unit, and Do-jin's former classmate in the police academy. She sympathises with Do-jin and befriend him despite knowing Do-jin's father's identity.
A police detective who investigated Hee-jae's case and was a mentor of Do-jin in the police force. He treats Do-jin with care and kindness. He was later killed by Hee-jae who escaped from prison.
An unscrupulous reporter who often make news reports about Hee-jae's case, and harasses both Do-jin and Jae-yi for the sake of getting more exclusive news reports related to Hee-jae as an advancement of her reporting career. She was murdered by Ji-hong who was earlier released from prison.
A female reporter who was Hee-young's rival. She also tries to get a scoop regarding the Yoon Hee-jae serial murders by approaching Do-jin and Jae-yi. Unlike Hee-young, she is more morally-equipped and realises to an extent the negative impact the reports about Hee-jae's case has on Do-jin and Jae-yi.
An obese, yet jovial and kind man who was Jae-yi's manager, and he cares about Jae-yi's welfare.
Jung Da-hye as Cheon Se-kyung
A famous actress who was Hye-won's junior prior to Hye-won's murder. She may look unfriendly and cold, but she is actually warm-hearted and caring to people around her, especially to Jae-yi whom she sympathises for her trauma of losing her parents.
Park Kyung-choo as Gil Sung-sik
Han Jae-yi and Gil Moo-won's father. He is a lawyer who was murdered by Hee-jae.
Han Jae-yi and Gil Moo-won's mother. She is an actress who was murdered by Hee-jae for treating his son well.
Hong Seung-bum as Lee Seung-woo / Yeom Ji-hong
An ex-convict who idolizes Hee-jae (after meeting him in prison) and sought to become a serial killer like him. After his release from jail, Ji-hong killed Hee-young as revenge for Hee-jae and even assaulted several people in different secluded places.
^ abIn order to circumvent Korean laws that prevent commercial breaks in the middle of an episode, what would previously have been aired as single 70 minute episodes are now being repackaged as two 35 minute episodes, with two episodes being shown each night with a commercial break between the two.[1]
^No episodes were aired on June 7 due to coverage of the FIFA Friendly soccer match between South Korea and Bolivia.
^No episodes were aired on June 20 due to live coverage of the 2018 FIFA World Cup Group B match between Portugal and Morocco.
^No episodes were aired on June 27 due to live coverage of the 2018 FIFA World Cup Group F match between South Korea and Germany. Aired 30 minutes earlier due to live coverage of the 2018 FIFA World Cup Group H match between Japan and Poland.
^Jung, Yu-jin (December 31, 2018). 소지섭 ‘데뷔 23년 만에 첫 대상’(mbc연기대상)[포토엔HD] [So Ji-sub Soo'First Debut in 23 Years' (mbc Drama Awards)[Photo and HD]]. Newsen (in Korean). Archived from the original on December 31, 2018. Retrieved June 5, 2020 – via Naver.
_Poster.jpg)
