Ah Hing is made pregnant by her master Fan Chun-kit. Fan soon leaves for his studies overseas while Ah Hing suffers gross prosecution and is reduced to becoming a prostitute. In a momentary slip of a struggle, Ah Hing commits manslaughter. Now a qualified lawyer, Fan acquits Ah Hing of the charge, and intends to marry her to redeem his negligence in the past. Ah Hing, however, is determined to pursue an independent life.

Third Sister Tai marries Dunce Lau and her life has since been between laughter and tears. At the birthday party of Tai's father one year later, Lau's wit suddenly comes back to him. Lau turns the occasion into a stage for displaying his talents and makes fun of his two brothers-in-law who used to despise him.