The story takes place in Shanghai during the Republic of China period. Zhang Tieqi (Xu Xiaoming), Rong Baichuan (Liu Jiahui), Zhou Chongyi (Wang Longwei) and Hu Jiangdao (Wang Hua) are the famous four kings of wind, thunder, rain and lightning on the beach in Shanghai. Among them, Rong Baichuan has a pair of twin children who have practiced martial arts since childhood. They are the eldest daughter Mingzhu (Li Saifeng) and the second son Haishan (Zhao Wenzhuo). At the time of the beginning of love, Haishan went on a blind date arranged by his father and secretly got married to the Japanese overseas Chinese Yokoyama Sakurako (Yuen Kit Ying). Sakurako's father Yokoyama Jubei (Kurata Yasuaki) is the head of the Japanese Ryukyu Kobuki. Due to the differences in culture and living habits between China and Japan, Sakurako made a lot of jokes after marriage. She is a martial artist and proposes to compete with Haishan. She is bumped into by Jubei who comes rushing over. He mistakenly thinks that Haishan is bullying his daughter. In addition, Onizuka (Guo Jianyong), who has a crush on Sakurako, instigates her. Sakurako is forcibly taken away by her family. Jubei, who is still angry, issues a challenge to the Rong family. Soon, a great battle between China and Japan will be staged in the Shanghai martial arts world...