Plot
Mo-pei-chai is a master swindler with a sassy wife and ten children who might not all be his due to his wife's numerous affairs with many men. After endless verbal abuse from his wife, Mo-pei-chai leaves his family for good and bumps into Kwong-kwan-chat, another swindler who is rather bumbling. Kwong-kwan-chat unsuccessfully tries to swindle Mo-pei-chai, who outsmarts him. The two later bump into each other again where Kwong-kwan-chat tries to play tricks on Mo-pei-chai but end up suffering from his own deeds. Afterwards, a middle man hired by Kwong-kwan-chat has arranged a gambling match with a deceiving tycoon, Old Wai, which Mo-pei-chai overhears and proposes a collaboration with Kwong-kwan-chat to swindle the tycoon where Mo-pei-chai uses a magic trick to turn blank paper into American currency to gamble while Kwong-kwan-chat poses as the local Security Captain and confiscate the tycoon's money. Although Old Wai turns out to be the father-in-law of the real Security Captain, they are successful in their scam. Afterwards, Mo-pei-chai and Kwong-kwan-chat get into a hilarious fight while splitting the money where Mo-pei-chai outsmarts Kwong-kwan-chat again and leads him arrested by the Security Captain and imprisoned. However, Kwong-kwan-chat rats Mo-pei-chai as his accomplice and the latter is wanted for a bounty as a result. A clever child, Mak Tau, manages to turn Mo-pei-chai in to the police.
Mo-pei-chai and Kwong-kwan-chat are imprisoned together but the latter has hidden tools to make a saw into his shoes and escapes, but Kwong-kwan-chat manages to convince Mo-pei-chai to get him out as well and proposes to swindle Old Wai again, but Mo-pei-chai dissuades him, realizing Old Wai was using counterfeits. It turns out Old Wai works for the town's biggest tycoon and philanthropist Tong Sei-nau, who orders Old Wai to kill Mo-pei-chai and Kwong-kwan-chat too cover up their crimes. Mo-pei-chai devises a plan to steal Old Wai's jewelries by having Kwong-kwan-chat slap Old Wai but when they execute the plan, they end up being beaten up by Wai's bodyguards, Iron Cow and Crazy Horse after a long fight.
Mo-pei-chai and Kwong-kwan-chat bump into Mak Tau and intend to punish him but encounter gang leader Ko-lo-sam, his wife Second Lady Lan, and brother Snake-eye To who wants to buy Mak Tau. They manage to outsmart Ko-lo-sam, but Mak Tau manages to flee. Mo-pei-chai and Kwong-kwan-chat then bump into Iron Cow and Crazy Horse who chase them, but Mak Tau helps them flee. The two men befriend the child and find out he is being hunted by Mok-ming and Kei-miu, a pair of married master martial artists who have gone insane from perfecting their skills. After Mo-pei-chai and Kwong-kwan-chat bring Mak Tau to hide in a temple, but Ko-lo-sam, Second Lady Lan and Third Brother To finds them. After a prolonged fight, Mo-pei-chai and Kwong-kwan-chat defeat the three, so Ko-lo-sam bring in Mok-ming and Kei-miu instead, who Mo-pei-chai and Kwong-kwan-chat are unable to overpower but they manage to tie the couple up as nd flee.
Mo-pei-chai and Kwong-kwan-chat put Mak Tau to sleep while they relieve their injuries and discuss about sending Mak Tau away as he is too much of a hassle, which the child overhears. The next morning, the two decide to not send the Mak Tau away, but is horrified to find the child gone, leaving drawings behind saying he is an orphan without a home and treated them as his only family and berates them for kicking him out. Mo-pei-chai and Kwong-kwan-chat spends the whole day unsuccessfully looking for Mak Tau. Afterwards, they encounter a young lady in a restaurant who informs them she is searching for her grandfather, who is an artist and maker of the counterfeit cash they show her. She informs the two that her grandfather was kidnapped by Tong while painting a portrait for Mok-ming and Kei-miu, who were his neighbors and went insane after their unborn child died and swears to kill Tong's son. At this time, Tong also sends his idiotic underlings to search for his son, who has an unusual birthmark of three dices on his buttocks. Mo-pei-chai and Kwong-kwan-chat discovers Tong's plan from his underlings who are searching on the streets and bumps into Mak Tau, who is held captive by Mok-ming and Kei-miu at the same time, and rescues him away while they fight unsuccessfully the couple and are captured by the couple who intend to barbeque Mo-pei-chai and stew Kwong-kwan-chat but Mak Tau comes in time to rescue them, telling the child to meet them at a tea stall afterwards. When Mo-pei-chai and Kwong-kwan-chat arrive at the tea stall, they find out Mak Tau has been abducted by Tong, who has also abducted the young lady looking for her grandfather while Tong shows her grandfather having gone insane while making counterfeit for him.
Tong poses as the young lady and writes a letter to Mo-pei-chai and Kwong-kwan-chat, who sneak into Tai's mansion and rescue Mak Tau after defeating Iron Cow and Crazy Horse. Mo-pei-chai and Kwong-kwan-chat then discover Mak Tau is Tong's son after seeing his unusual birthmark and sends him to Tong hoping to collect the bounty reward. Upon arriving at Tong's mansion, Mo-pei-chai and Kwong-kwan-chat realize Tong intends to kill the two to cover up his crimes and attempt to flee but only Mak Tau is successful in doing so while the two men are captured. However, with the help of the young lady, Mo-pei-chai and Kwong-kwan-chat are able to make a run and temporary hide wedding banquet of neighbor Mr. San's son until Tong, Iron Cow and Crazy Horse arrive. A big fight erupts where Mo-pei-chai and Kwong-kwan-chat manage to defeat Iron Cow and Crazy Horse with the help of laxatives, but are no match for Tong, who is an expert fighter. Mak Tau arrives with Mok-ming and Kei-miu who fight and defeat Tong. Kei-miu is suddenly pregnant again and happily leaves with Mok-ming while Mo-pei-chai says it is time to part ways with Kwong-kwan-chat but really intends to woo the young lady. While Mo-pei-chai is on a date with the young lady and Mak Tau, Kwong-kwan-chat surprises him with his wife and ten children.
