A strange and bizarre journey of the demon world began in the midst of crisis and doubt.

The French Concession Inspector Zhong Lang accidentally rescued Qian Shouchang, a wealthy businessman who was attacked by a killer. Boss Qian was very grateful and invited Zhong Lang to settle in the Qian Mansion on the day of his birthday banquet to ensure safety.

Lin Xiang and Lan Fang, who is pretending to be his wife, are sent to Shanghai to rebuild the underground headquarters and help liberate China from the Japanese invaders.

Prices are soaring, gangs, warlords, and foreigners are rampant and domineering. The oppressed and bullied people most hope that justice will come. So a group of righteous and brave young people stepped forward and used their wisdom and faith to disperse the darkness.

A rental house in Shanghai caught fire. Yu Shengnan, a female professor at the Medical University, found a woman's body very suspicious, so he quickly called the chief inspector Zhong and his partner Han Fei. After preliminary autopsy and on-site investigation, Katsuo and Zhong Lang concluded that the deceased was murdered before the fire...

On a quiet day, Abin, a boxer who claims to be a friend of Zhong Lang, called the laboratory of St. John's University and asked Yu Shengnan to tell Zhong Lang that there was an important life-threatening matter to him.

In the old Shanghai before liberation, forces from all sides gathered here, and they grew up and down, rampant and domineering. The two major underworld forces, the Qinglong Gang and the Qilin Gang, often fight for supremacy, and blood splatters on the streets. One day, three members of the Qinglong Gang were dead on the street.

Taking advantage of the holiday, Yu Shengnan, a female professor at the Medical University, came to Guanghua Relief Society to see a doctor for the poor. Zhong Lang, the inspector of the patrol room, came here to visit Shengnan, and met Shengnan who had helped him back then.

Located in the Ma Sinan Road Prison in Shanghai's French Concession, the police detective Zhong Lang, his partner Han Fei, and Yu Shengnan, a female professor at the Medical University, jointly arrested Yu Liben, a murderer who cut his throat.

The film tells the story of three good friends Hu Yan, Fujisawa, and bullfrog, each of whom has lost their jobs due to three women. The desolate three decided to form an alliance to avenge each other.