Miu works as an underwear investigator in the R&D department of an underwear company. Miu (Stephy Tang) was a diligent student during her schooling days. She loved fantasy but had never tasted dating. However, after moving into the former residence of her aunt (played by Lu Mixue), Miu realized something. It turned out that although my aunt had a successful career, Yunying was still unmarried and was still a virgin when she died. There is a room full of beautiful underwear of different styles, but no one to show them to. Miu, who doesn't want to become an old aunt, is determined to find a man to have her first love. The news spreads from person to person, and a large number of suitors suddenly appear around Miu, including the prince Antonio (played by Wang Zulam), a new talent (played by Farmer Luk Yong) and a bank manager (played by C Jun). Miu has already She was so dizzy that a "love expert" Lucas (Ronald Cheng) appeared and stared at her. Fortunately, she has several good sisters with rich love experience, Donut (played by Janice Man), Celine (played by Tang Yi) and CC (played by Jia Xiaochen), who help her and inspire her about underwear and love relationships, which makes Miu's understanding of love and love. Men all have new experiences.

My cousin Donut, who lives with Miu, is a saleswoman in a lingerie store. She is only interested in mature men, and by mistake she develops a triangular relationship with the son of her mature boyfriend; a regular customer of Donut's lingerie store is a A promiscuous woman, she is very good at dealing with male guests but will never have true feelings for them. However, the appearance of innocent Eugene (Andy On) makes CC fall in love; Miu and Donut's neighbor Celine is a flight attendant and married to a rich man. Being rich is her unwavering ideal, but the appearance of a poor boy (played by Xu Tianyou) takes good care of her, and a "ghost" love develops.

Lucas was also moved by Miu's innocence in love, and decided to become her love consultant, choosing a man for Miu, himself. Donut didn't want the last two, and her breakup was filmed and became a hot short video on the Internet. Poor CC woke up and the innocent Eugene took away everything, including her heart that was still capable of falling in love. In the end, Celine's ideal of marrying into a wealthy family remained unchanged, but she was willing to wait for the day when a poor boy would have a successful career. Everything gave Miu a new understanding of love and men.