Niu Dabao (Bao Beier) wholeheartedly likes a woman named Yuan Yu'e (Wang Ou) and launches a passionate offensive against her. Unexpectedly, he accidentally becomes a member of Huanghua Station, the main post station in Beijing. Later, Niu Dabao is shocked to find that Yuan Yu'e is a member of the Hong Gang, which is one of the anti-Qing gangs that Huanghua Station vigorously suppresses and clears. Although Niu Dabao is not good-looking, he has extraordinary wisdom. On the surface, he is loyal to Huanghua Station and has gained the trust of the post station chief Long Dinghai (Lin Xue). On the other hand, he repeatedly lends a hand to Yuan Yu'e when she is in distress, and therefore meets Chunhua (Jia Ling) and Tie Qianding and other capable people. Niu Dabao discovers that a sinister conspiracy is brewing in Huanghua Station. Can he use his courage and wisdom to crack this conspiracy and protect the safety of the people?