Love Undercover 3 (2006)

Lau Ching, a Mainlander with an incredibly powerful right arm, arrives in Hong Kong to find his cousin. He befriends with a drifter named Handsome, and a martial artist girl named Mandy. In order to woo her, Ching participates in a fighting competition in hopes of winning a $10 million prize, and must defeat his love rival, Wai, in the ring.

The hero Fong Sai Yuk becomes involved in the secret brotherhood "The Red Flower", who are trying to overthrow the Manchurian emperor and re-establishing the Ming dynasty. The social upheaval is combined with Sai Yuk's personal moral conflict about how to conform to the rigid regime of the brotherhood and on top of that sort out his difficult love life, saddled with two presumptive wives.

Ho Kam-An is a lovestruck dim sum delivery boy who falls for a beautiful judo student. After being humiliated by her boyfriend, Ho Kam-An seeks the services of an aging master who teaches him a half-assed style of kung fu, "Karate Kid"-style.

Star Chow, an officer in the elite police unit, resigns when he is made a scapegoat for a botched investigation. He goes undercover at a school to complete the case and realizes a bumbling detective is also undercover as a student.

Sing, a dumb, lovable mainlander with supernatural powers comes to China to visit his uncle Tat. When it's revealed that Sing can see through objects, Tat employs him as "The Saint of Gamblers," and proceeds to set him loose in the gambling world.

Ko Chun, the God of Gamblers, vows to keep his identity hidden while looking for the gangsters who murdered his pregnant wife.

Billy Wong is a New York City cop whose partner is gunned down during a robbery. Billy and his new partner, Danny Garoni, are working security at a fashion show when a wealthy man's daughter, Laura Shapiro, is kidnapped. The Federal authorities suspect that Laura's father is involved with Mr. Ko, a Hong Kong drug kingpin, so the NYC police commissioner sends the two cops to Hong Kong to investigate.

After being dumped by his fiancé, heartbroken Hong Kong police officer Fallon Zhu gains 200+ pounds. His superiors demote him to the job of escorting convicts to Japan. When a convict in his custody mysteriously dies, he must team up with citizen Thor to solve the mystery.

In an attempt to save his village from being taken over by brutes, Wah is beaten to a pulp and his mother brutally murdered. Determined to take revenge, Wah learns the art of Wing Chun and enters into a showdown with the nasty villains.

Three middle aged men polish their martial arts skills to avenge their fallen master.