Identical twin brothers Donghyuck and Haechan were separated by their mother's former underworld comrades. Their mother had a forfeit for cutting her ties with them which they fulfill by taking one of the twins with them. Years pass and now Haechan is one of the most feared Don of the underworld. It is not only hard to chase him, but is impossible. Meanwhile, Donghyuck is a soft and nerdy person and is soon to be a journalist. He lives with his mother who always warns him about the underworld and its dons which only makes him curious. One day, the twins encounter each other in a very unexpected way and the action begins.