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Context: Guest's father was murdered years ago. To find the culprit, Guest visits Choi Mu-won, who was in the same gang as their father, and asks him to find the killer. Guest's only thought is, "When I find them, I'll kill them with my own hands." However, Mu-won trains Guest to become a killer. By pitting Guest against other yakuza, Guest has grown strong. During this time, it is revealed that the police were responsible for the father's death, and Guest infiltrates the corrupt police force. There, Guest gradually grows closer to a detective named Jeon Pil-do... Spoiler Alert: Mu-won has been deceiving Guest; Mu-won was the one who killed Guest's father. In reality, Guest's father was not a yakuza but a police officer who had infiltrated the organization to expose Mu-won's crimes, but was discovered and killed. Mu-won is merely using Guest. Guest's father never told Guest that he was actually a police officer.