In the boxing ring, Tan Kai (played by Yang Kun) can be knocked down, but he will never admit defeat. In an accident, the boxing ring took away Tan Kai's brother who he had known for many years. Under the blow, he chose to retire and leave; by chance, he learned that his brother's heart was transplanted into the body of a girl named Lichuan (played by Xia Zitong). In order to redeem the continuation of this life, he picked up the boxing gloves again. There is no excellent physical fitness, no advanced tactics, and even no audience cheering for him. But Tan Kai, who has always been accustomed to fighting alone, has the heart of a champion as his strongest will, which is enough to support him from falling. Tan Kai keeps punching his opponent with his life on the stage, and the next person he is going to defeat is himself.