In the heart of Seoul, the inheritors of the most successful companies, will do anything to keep their company in the top ten ranks for every month. The high class society these young adults live in has always been pressuring but at the same time, luxurious and splendid. Along with hanging out with their rich friends and spending hella lot of money, outsiders will surely think they have the best lives. But do they? When Roseanne park and Jay Jeon were thirteen, they come across a murder during a big party. Ever since then, they have kept quiet but recently decides to open the case with their other friend Ezra park. On the way of solving the case, they come across dangerous secrets of the business worlds. On top of that, a haunting message arrives to Roseanne and her other three best friends: Unknown : I will make your life into a living hell. You deserve the worst.You are going to regret everything you did. The unknown person seems to know every dark secrets, they have kept. Those which not even they have disclosed to each other. Following them everywhere, clicking pictures and threatening. They have no clue who this person is. But what did they do to deserve this? Only they and the person would know right? . . "You are a bad person and you know it too :)" . .