A biopic, Champion details the life of Duk Koo Kim, South Korea's most popular boxer, who, in his rise to international fame, faced the reigning lightweight champion Ray Mancini at Caesar's Palace in Las Vegas, Nevada on November 13, 1982. Kim ultimately lost the match after fourteen rounds, and within minutes, dropped into a coma from which he never recovered. The match changed boxing rules around the world; and affected South Korea especially.