Middle-aged deliveryman Liu Yishou, after facing humiliation when his old rival Zhang Shihao deceived his senior brother and publicly mocked him as the 'eternal runner-up', decides to fight for his dignity, family, and brothers. At the advanced age of 45, he re-enters the King of Boxers championship hosted by Zhang Shihao. Along his path of advancement, he successively defeats strong opponents from South Korea and Japan, shocking the entire internet as 'Delivery Rider Turns Boxing King'! In the finals against the arrogant American boxer, with his left eye split open and falling to the ground, humming 'My Motherland' amidst the ties of family and friends, he rises from a desperate situation, smashing his fists laden with twenty years of resentment and fury into his opponent! Achieving a defying counter-attack! With firm conviction, he interprets how a mortal body can also forge a legend!