This metropolis has a love story of "on and off"... The story begins with a certain type of girl who dominates all of Asia. This kind of girl is called "Post-it Girl". She is simple, plain, and content with her small wishes. She has never been anyone special nor does she expect to become someone special. Her role is small but indispensable, just like a Post-it note that can be torn off and used at any time - not particularly noticeable, but she's definitely around you! A "luxury cruise" trip allows such an ordinary girl to encounter the most extraordinary event in history.
Xinyi has always been afraid of being disliked by others since she was young. So she has always tried hard to be nice to others. As long as someone gives her a little response, she easily falls for them. Everyone calls her a Post-it Girl because when someone needs her, they can tear her off and use her, and when they don't need her, they can throw her away without a second thought. But she is actually a sentimental fool. Her lack of strength often makes her soft-hearted when she needs to make decisions. One day, in order to win back her fickle boyfriend Gucci, she spends a large sum of money on a cruise tour. Unexpectedly, she enters the wrong room by mistake and wakes up to find that she has spent a night with a stranger. She also discovers that her boyfriend Gucci has been cheating on her with a rich widow and left her behind. This is a shocking blow to her.