Synopsis：The aspiring "Gambling Champion" Wah Jai returns to Hong Kong. Following his master's instructions, he donates all the money he wins from underground casinos to charity through his good friend Siu Bak Wu. At a square, a mountain teacher named Mui Ching and a Hong Kong journalist named Yuen Chun are collecting donations for children in mountainous areas. With the help of a female magician and the passing-by Wah Jai and Sing Jai, the two women raise a large amount of donations, and both Wah Jai and Sing Jai develop feelings for them. To better assist the women, Wah Jai and Sing Jai disrupt the cheating schemes of the strategist and the gangster Sang Biu while at the casino, thereby offending the casino's backer, the big boss Dragon Bao. Dragon Bao sends his men to pursue them but fails; instead, they capture Mui Ching and demand that Wah Jai and his team participate in a Gambling Champion Challenge to decide the outcome. To rescue Mui Ching, Wah Jai and Sing Jai go to the horse racing track to seek help from the horse-racing commentator Uncle Hung, raising the entry fee through horse betting. What will be the result of the final gambling showdown? What secret lies behind the Gambling Champion?