Ip Man (Donnie Yen), who has already established a business in Hong Kong, lives a peaceful life with his wife Cheung Wing Shing (Lin Dai Lin). Unexpectedly, a gangster harassment incident occurred in the primary school where his youngest son Ip Ching was studying. The person involved in the riot was Ma Jingsheng (Patrick Tam), a former apprentice of Tin Ao Shan (Bryan Leung). So Ip Man led his apprentice Xu Li (Cheung Chi-Chung) and others to protect Mr. Huang (Karena Ng), the principal (Liu Yi-Tat) and the primary school students, and met the driver Zhang Tianzhi (Zhang Jin), who was also a descendant of Wing Chun. The two of them admired each other. But the incident did not stop there. Ma Jingsheng's boss (Mike Tyson) was the mastermind behind the scenes, and Inspector Fat Bo (Kent Cheng) was also involved. At the same time, Zhang Tianzhi challenged Ip Man to see who was the "authentic Wing Chun". How should Ip Man respond?