In the ring, Kai Tan can be knocked down, but will never be defeated. In an accident, boxing takes the life of Kai Tan's closest friend, miserably and shocked, he then chooses to retire. Once, he happens to learn that his friend's heart has been transplanted into a girl called Lichuan. In order to save the continuation of his friend’s life, he puts on his boxing gloves again. There is neither excellent force and skill, advanced tactics, nor even an audience to cheer him up, however, Kai Tan, getting used to playing alone, has a champion's heart which is powerful enough to support him from falling. Kai keeps on delivering heavy punches at his opponent with all the soul, and actually, the next one he is going to beat is himself.