"You're my one and only. I've had a crush on you all these years."
After an accident, Song Yu's classmates find out that her mother was accused of being a homewrecker. Soon, everyone knows about it.
People who dislike Song Yu start ostracizing and bullying her. No matter how she explains, nobody believes her. Because of this, she becomes sensitive and insecure.
When she is at her most helpless, Xu Xin tells her he believes her, protects her, and helps her catch up on the lessons she's missed.
From then on, Song Yu opens a door in her heart for Xu Xin, the one and only door.
Theme: Not sure yet
