In the last boxing match before his retirement, Tan Kai accidentally beats his teammate Wang Yao to death. Wang's heart is donated to a young girl, Lichuan. Guilt-ridden, Tan Kai decides to meet Lichuan and they slowly develop a friendship. Suddenly Lichuan's body is starting to reject Wang's donated heart and a new surgery is very expensive. To pay for his sins and the surgery, Tan Kai must put his boxing gloves back on one more time.
