Chae Do-jin – Starring Jang Ki-yong

28-year-old lieutenant that graduated from a police academy
He is cheerful, positive and has a strong sense of justice. On top of that, he has outstanding good looks. This is why people think he must be from a wealthy family, but in reality, he is the youngest son of Korea’s worst serial killer Yoon Hee-jae, and his actual name is Yoon Na-moo. Even to this day, his feelings for his childhood sweetheart Gil Nak-won are deeply rooted inside his heart. He still feels like exploding when he thinks about Nak-won, who lost her parents because of his father.

Han Jae-yi – Starring Jin Ki-joo

One of the top actresses of Korea
Influenced by her mother, a well-known actress, she dreamt of becoming an actress since her childhood. She experienced a horrendous incident, but overcomes it and decides to walk the path of an actress. She is bold, cheerful and pleasant, and is currently the hottest icon in Korea with numerous fans. This is why people never imagined her to be the daughter of the former top actress Ji Hye-won, a victim of Yoon Hee-jae. Yoon Na-moo is her childhood sweetheart and the son of her bitter enemy who killed her parents. However, she is scared she would fall in love with him again if she sees him.

Yoon Hee-jae – Starring Huh Joon-ho

Psychopath serial killer
He is superficially charming and has a high self-esteem. He controls others with his pathological lies, and lacks a sense of regret, guilt and empathy. He has a constant need for stimulation with no sense of responsibility, and is very impulsive. He shows favoritism towards Na-moo, his youngest son who is gentle and wise unlike his older son, who takes after himself. This is why he becomes irritated by how close Nak-won’s family gets to Na-moo. It always makes him feel better when he gets rid of things that irritate him, so he eliminates Nak-won’s parents. He wouldn’t have hurt them if they had not provoked him.