On recommendation of the Chief of Marine Force, Dragon Ma is transferred to be in charge of the district of Sai Wan after the Superintendent, Chun, is thought to be staging his arrests.

He learns that Carina is a member of the Chinese revolutionaries headed by Dr Sun Yat-sen. Dragon identifies himself as the new superintendent of Sai Wan Police Station, after realizing that all of his policemen except one has been taking bribes.

Ho, the only upright policeman around, tells them that a gangster named Tiger Ow with gambling dens and other illegal businesses is the kingpin of the town.

Following a big fight where the policemen are badly outnumbered, the Marine Police show up with guns and force the gangsters to surrender.

Dragon is put in charge of the Governor's security for a birthday ball he is throwing for his adopted daughter.

After the ball, Carina is kidnapped by agents of the Empress Dowager, who are working with Chun; they trap her in a wardrobe at Yesan's house.

Chun arrives to visit Yesan, and the commissioner hides under the bed, where he sees Ma and Ho.

Eventually the Imperial Agents are arrested, the revolutionary chief escapes, and Dragon is handcuffed by Chun so that he can be brought to the main prison.

[2] In South Korea, it was the second highest-grossing film of 1987,[7] with 176,273 ticket sales in Seoul City,[8] equivalent to an estimated ₩616,956,000[9] (US$750,036).

[14] Mike Pinsky of DVD Verdict called it a "time filler" for Chan that does not live up to the previous film.