Um Tae-goo, Lee Hye-ri, Kim Hee-won, Choi Jun-young, Lee Sul, Choi Deok-moon, Im Seong-mi, Lim Han-bin, Jang Sun
Byung-gu, a once-famous former professional boxer, makes ends meet doing odd jobs at the gym. While eager to start boxing again, he gets diagnosed with "punch drunk syndrome," a condition caused by cerebral concussions. One day, a new member of the gym arrives and volunteers to help Byung-gu.