"May I ask how your social skills were in school?"
"I got along well with everyone in school."

The blatant lie from Choi Yunho, a perpetrator of terrible school violence, marks the beginning of it all. Twin brothers, Lee Jin and Lee Joon, who were both victims of Yunho's bullying, seek to personally condemn the man. "I hope you don't just give up half-way." From now on, it's time for the role of the bully and victim to be reversed. But what are the feelings of each of the persons involved in these acts performed in the name of revenge? Will the three find their way in the dark and hopelessness?