A talented young boy called Qin Feng failed the entrance examination for police school so his grandmother sent him to Thailand with his cousin Tang Ren, who is known as "the best detective of Chinatown." Actually,Tang Ren is an "obscene" man and becomes a mysterious murder suspect after a night of crazy drinking and tons of pretty ladies. Qin Feng and Tang Ren have to run for their lives... while "Crazy Dog Detective Huang Landeng is in hot pursuit. Tang Ren and Qin Feng need to mutually reinforce and try their best to escape the hunt of the police and thieves. Meanwhile, they have to find the lost gold and solve the real murderer within seven days.