A film adaptation of the boxing comic of the same name, published in 1986, which made cartoonist Huh Young-man a star. Kang-to, who started boxing out of pure emotion, loses his entire family except for his brother, who falls into a coma after a sudden disaster. Despite this, he turns professional, but misfortune continues, leading to his disqualification as an athlete and a prison sentence for an assault case. In despair, Na-ra, who had disappeared for a while, reappears and trains him with the 'chameleon' method. They finally achieve an unbelievable victory, but Na-ra leaves this world, leaving behind the sobs of his wife, Shin-hye. Kang-to realizes the true meaning of love and begins a new life with Na-hee, Na-ra's sister.