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.
Um Tae-goo
as Byung-gu
Lee Hye-ri
as Min-ji
Kim Hie-won
as Master Park
Choi Jun-young
as Gyo-seok
Lee Sul
as Ji-yeon
Choi Deok-moon
as Mr. Jang
Im Seong-mi
as Doctor
Lim Han-bin
as Han-bin
Jang Sun
as Staff
Yoo Chang-sook
as Min-ji's Grandmother