The Story of Lu Yanqiu and Mei Yubing

Moi Yuk-bing, a lady who has always been ill, has a step-mother, Chu Ming-fung, who treats her badly, so bad that the step-mother even tries to replace Yuk-bing with her own daughter, Moi Yim-tsu, as the bride of the promising Lui Ngan-chau. Deeply in love with Yuk-bing, Ngan-chau insists it has to be Yuk-bing or there will be no bride.

On the weddying day, Yuk-bing drinks a cup of analeptic too strong for her by accident hence starts vomiting blood. Ngan-chau's father, who hated Yuk-bing's illness all along, takes the chance claiming she must be a burden and orders his son to marry her sister, Yim-tsu, instead. Ngan-chau makes up a reason, saying he has urgent business in the army, then rushes out the door before the marriage is done. Seeing the left alone Yim-tsu desolated, Lau Si-yun, the scholar who has always been admiring Yim-tsu, comforts her, from the chair then to the bed.

After the night, the bride in affair finds a book on her desk, the book of chastity. She thinks it must be her sister found it all out hence plans to end her for good. Her plan is to poison Yuk-bing by sending cakes, but it goes awry, her own mother eats the cakes and leaves none for her step-sister.

Finding only her dead mother and Yuk-bing in the whole house, it is only logical to switch the blame of murder to Yuk-bing...