Among the three sons of Old Mr. Lo, his favorite is Lo Kung, the eldest of the three. The only thing Kung does all day long is play about. This has enraged the elderly Mr. Lo greatly. As a result, the father-son bond is damaged. The two brothers decide to pull a prank on Kung on his birthday because he is his birthday. He is led to believe he has won the lotto, but this is a ruse. Because Kung is so happy, he spends an incredible amount of cash. To get out of debt, the man pretends to be insane and the rest of his family believes him. They treat him like a son and confide in him. ' This act of deception helps Kung mature and, as a result, the two of them are now on excellent terms.