20 years ago Moo-Yeom’s father was a suspect in the "Gap Dong” serial murder case. Because of the detectives’ oppressive investigation, Moo-Yeom’s father killed himself. Now, Moo-Yeom is a detective and works to capture the killer Gap Dong. The statue of limitations has expired for the serial murder case and Moo-Yeom resigns to the belief that Gap Dong is dead. New clues though for Gap Dong appears in front of Moo-Yeom and he sets out to catch him once and for all.

Jae-Bak is a 40'ish man who has become burned out by work and his family. He works as a sales manager for a publishing company. The highlight of Jae-Baek's day is now when he steals a glance at beautiful young Yu-Hee every morning as she stands waiting for the subway, while sucking a red lollipop. For the next 100 days, Jae-Baek watches Yu-Hee and then finally meets Yu-Hee. At a bookstore, Jae-Baek meets Yu-Hee. Jae-Baek follows Yu-Hee to her home.

Eulji Hae-Yi, a lawyer at a big law firm, is a kiss-up to those with power, but looks down upon those who are poor. When she meets death-row convict Jang Hwa-Sa in room 9 in the prison visitation area, their bodies are exchanged.

Joon Ho is a third year high school student who just finished taking his university exam. His main interest is to sleep with Seo Yeong, his girlfriend, but, so far, she has turned him down.