In Hong Kong, a terrorist organization plans to blackmail the world's government with the help of two fatal diseases a goofy scientist created. Two Interpol agents went to stop their evil plot of world domination, but one of them became a victim of one of the diseases and wanders off acting like a six-year old child. He mindlessly walks into a bullied action film star's mansion, and the star, Jones Bon, was forced to babysit him while dealing with affairs involving his divorced wife and his two daughters. Only a short period of times has passed when Jones, although paying more attention to solving his family situations, finds himself fighting the terrorists.

May is a martial artist and Chinese medicine practitioner who resides in a temple in Omei mountain. Under the threat of her lovelorn master, Misery, she decides to seek the help of infamous womanizer, Tiger Hung, who she had helped earlier, in order to experience heartbreak and master the "Heartbroken Sword" technique to defeat her.