During the Northern Song Dynasty, on the empty island, there lived five sworn brothers who were nicknamed "Five Rats". Song Renzong gave him the title of "Royal Cat" because of his meritorious service in protecting Baogong. At that time, Pang Ji, the traitor grand master, hated Baogong very much, so he deliberately sent people to provoke Baogong to ask Renzong to give Zhanzhao the "Royal Cat", in order to destroy the "Five Rats". The five righteous men were very annoyed and went to Tokyo to compete with Zhan Zhao. On the way to Tokyo, the "Five Rats" learned of many evil deeds of Pang Yu's son Pang Yu in Chenzhou, and decided to go to Chenzhou to punish Pang Yu first. Wanting to eradicate the treacherous ministers Pang Ji and Pang Yu, Bao Gong had no choice but to use another strategy. He asked Zhan Zhao to pretend to lose money in a bet. Pang Ji used this to save Zhan Zhao and sent him to Chenzhou to help Pang Yu. . Zhan Zhao used Zhong Yuan's identity to infiltrate Pang Yu's residence, and found a lot of Pang Yu's criminal evidence. The "Five Rats" cooperated with Zhan Zhaoli Yingwai, and even cleared the grievances of Baogong, and beheaded Pang Yu, eradicating this scoundrel for the people of Chenzhou