“It really doesn’t hurt at all.” Jeong-bin, a professional stunt double specializing in slaps, has left his shameful past as a drifter behind to pursue a proper life in the film industry. He takes on the role of getting slapped on various film sets. However, one day, something unexpected happens. Chang-hyun, a friend from his school days who had left a strange impression on him, shows up as his co-star for the day.