After Leung and his mother are expelled from the family, they are housed by a fortune teller. Leung is a lucky guy and brings good fortune to his mother. On the other side, Yat's presence poses a tragic threat to his family. Eventually, Yat's parents die, and Leung's mother decides to raise Yat, and the two boys exchange their names. However, their lives will turn upside down when they reach the age of thirty. The only way Yat can retain his luck is to overtake all the good luck from Leung...