A light-hearted comedy about "sing lui" (unmarried middle-aged women). Heung Gwong Lam is a rich single man, who has a belief to be trendy, hot and handsome. He works as a creative director at a PR company. However, due to past experiences, he feels he's a bad man and feels a lot of sympathy for "sing lui", whom have been dumped by men and still haven't settled down yet. He decided to repackage these women and thoroughly change their way of thinking. He is determined to change them from "Left Behind Lady" to "My Prime Lady". One day, Sing Fa Lui, who had an 'one night fate' with Gwong Lam unexpectedly appears at the PR company as the rumored lover of the boss. She took advantage of the one mistake Gwong Lam made, and successfully climbed up to his director level, posing a threat to Gwong Lam's career. Unfortunately at this time, another "sing lui" comes into the picture. This "sing lui" is troubled by love and feels a heart of guilt deep down. Gwong could only continue to help these "sing lui" get their life back together. After a long bickering battle, Fa Lui realized Gwong Lam isn't a bad man after all. Gwong Lam also discovered underneath Fa Lui's "sing lui" mask, she is actually quite sincere. It was just Gwong Lam didn't have confidence to commit to any woman. For her happiness, he decided to help Fa Lui become a perfect woman and market her out.