Lee Jae-ha had spent his entire life staying far away from fighting. With no particular dreams or talents to speak of, Jae-ha discovers that he actually possesses an incredible talent for combat. "What am I supposed to do just because I'm good at fighting...?" But Jae-ha has no interest in fighting and remains indifferent even when his friend, Lim Myeong-in, encourages him to take up martial arts. So, without Jae-ha's knowledge, Myeong-in enters him into "Never Back Down," a program that searches for hidden gems with extraordinary potential in combat sports...