Li Nuo is a deliveryman who was urged to get up by his father Li Fu Hai every day. While delivering food, he met the old boxer Li Tie who was about to retire. It was this "chance encounter" that caused Li Nuo to lose his job as a deliveryman, which made Li Fu Hai even more dissatisfied. This "chance encounter" allowed Li Nuo to see other boxers being knocked down again and again in the boxing ring, and the scene of bravely getting up again and again lingered. Li Nuo decided to start boxing without telling Li Fu Hai, who was once a boxer. But Li Fu Hai accidentally discovered that Li Nuo was practicing boxing. After being knocked down by a heavy punch in the boxing ring, Li Nuo bravely got up. This scene surprised Li Fu Hai a little. After repeated self-struggles, he decided to violate the agreement with the deceased Li Nuo's mother and support his son in boxing because it was the child's dream.