Kang Si-U is sent to prison due to a certain incident in the past. After being released from prison, he joins hands with Do Ji-Hyeok in order to take revenge on Kang Ha-Jun who ruined his life. Kang Si-U has only one purpose: to make Kang Ha-Jun feel the same as he did. But the more he hates him, the more Kang Si-U gets caught up in the past when...