Growing up as a street brat Jooheon joins one of the most notorious gang in Seoul, but after watching his best friend get killed by the gang he called family, he has no choice but to live life on the run with hopes of leaving it all behind. Leaving the NuBoys comes with a cost, his life. While planning to get revenge for his friends death, Jooheon encounters the dorky and clumsy Kari who he can't help but feel some sort of attraction towards..There's something Kari isn't telling him though. She happens to be the daughter of a famous police investigator. Faced with deceit and betrayal can Jooheon really trust anyone? Will he manage to avenge his revenge for his friends death ?