Hong Kong's famous liar Wong Tai-chien (Sam Hui) has superb deception skills and has made a fortune with his cunning wisdom for decades. Although the deceived are greedy or negligent, they all beat their chests and stamp their feet in regret. The bald detective (Mai Jia), nicknamed "Stupid", has been fighting wits and courage with Wong Tai-chien for 20 years, playing cat and mouse games, but unfortunately this stupid cat can never beat the cunning mouse. The father of Wu Baocang (Joey Yung), a girl living in Hong Kong, was deceived by Wong Tai-chien and wanted to jump off the building several times to understand his life. Baocang learned from the police that Wong Tai-chien had fled to Singapore, so she got up and went to track him. Here she happened to meet Ferrari (Nicholas Tse), a rich kid who had been deceived by money and love and turned to deceive people, and Shi Shengzi (Alec Su), a dull private detective assistant. The three young people decided to join forces to defeat the strange Wong Tai-chien...