In 2021, Shinji Sawamura (Masaki Suda), who hates his mother because she abandoned him, and resists the society after finishing reformatory, Kenji Niki (Yang Ik-june), a shy man who was abused by his father and suffered from stuttering and blush social phobia and Horiguchi (Yusuke Santamaria), a former professional boxer meet by accident. Horiguchi recommends Shinji and Kenji to come to his boxing gym. Since then, Shinji and Kenji stay at the gym like brothers and train themselves to become a professional boxer. Everything seems to go well, but suddenly Shinji and Kenji become alone again. Kenji finds his goal to make a bond with Shinji through boxing. They need each other to fill their loneliness with the passion for boxing.