The story is about a boxer who retired as a soccer athlete due to a heart problem from an unexpected accident, meets Bok-hee at a factory where he got a job for a living and falls in love.

Jeong-yoon and Jong-bae own a car body repair shop together that gets in financial trouble. To help cover the losses and take care of her family, Jeong-yoon decides to smuggle thirty kilograms of cocaine.

A by-the-book police officer is assigned to secretly investigate a team leader who believes that the rules shouldn't stop an investigation. As the officer investigates further, his own attitudes begin to mirror the team leader's.

The friendship between a lawyer who will do anything to make money and a nursing home volunteer.

Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.