There is nowhere that Seon Jin can find solace. At school, he is ruthlessly bullied due to his unsettlingly quiet nature and weak appearance. However, this is not the source of Jin's insurmountable terror: the thing that he fears more than anything else is his own father.To most, Jin's father is a successful businessman, good samaritan, and doting parent. But that is merely a facade; in truth, he is a deranged serial killer—and Jin is his unwilling accomplice. For years, they have been carrying out this ruse with the police being none the wiser. However, when his father takes an interest in the pretty transfer student Yoon Kyun, Jin must make a decision—be the coward who sends her to the gallows like all the rest, or be the bastard of a son who defies his wicked parent.

Handsome, successful, and talented, detective Hiroki Dan has it all. Each investigation solved is another good deed to add to his pile of closed cases. However, while his work is fulfilling, there are still times when he becomes frustrated; the police are helpless when vile people are beyond the reach of the law. It is for this very reason that Hiroki takes matters into his own hands.An eye for an eye and a tooth for a tooth, Hiroki exacts twisted justice on the dredges of society, one 'good deed' at a time.