Beijing in 1949, the Kuomintang spy frequent rebellion, a fire burned the Beijing tram depot, Beijing public transport damage. Combat hero was born Sun Guangda transferred to the Public Security Bureau, and rich experience but the body and a bad habit of old police Qian Yougen together investigation the case. With Qian Yougen's help, Sun Guangda uncovered a major case; Sun Guangda helped Qian Yougen save Zhao Chunhua, and set up a family. Qian Yougen's brother Qian Youcai's death in Sun Guangda, Qian Yougen two people buried in the heart of the misunderstanding. Sun Guangda to unravel it all the misunderstanding, to rehabilitate money Youcai, only grasp the parties Zhang Youyi can Zhang Youyi abnormal cunning several times escaped the police raids. Finally, Sun Guangda finally caught Zhang Youyi, Choi has been vindicated injustice money. Qian Yougen experience a series of twists and turns, eventually like "rival" Sun Guangda son Weiguo sun the sun Weiguo as his son-in-law, son and their detection Juexue teach Weiguo. When Sun Guangda and Qian Yougen in National Day, finally, find the brotherhood of wine.