Lau's character is the elder sister of the female typist, played by mainland actress Jiang Xin, best known for the 2011 hit TV series Empresses in the Palace.
Speaking about her role, Lau says: "She is a kind woman. Unfortunately, she lives in a society that had some ridiculous bias against women, making her a tragic figure."
Her character named Gu Manlu is forced into prostitution following the death of her father, the only bread-earner in the family, and has to marry a businessman who uses her as a plaything and even has his eyes on her younger sister.
