![Um Tae-goo](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw200%2F%2Ff5vUvEXBSGwIVaj3tQGMA1i7AEk.jpg&w=3840&q=75)
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.