Thirty years ago, an unsolved case of the theft of a golden pig occurred. Fat Crab (played by Sammo Hung), who turned out to be the best among the Chinese detectives, was dismissed because he was too obese. He also suffered from mild brain degeneration and was returned from the battlefield. Doctor Ruan Xiangchang (dean) of the National Border Doctor (played by Lin Mincong) together with other elderly people who were picked up (Wu Yaohan, Liang Xiaolong, Teddy Robin...