Chen Ran saved Song Jiayu's life when they were children.
So, from a young age, Song Jiayu was taught to "be good to Brother Chen" and "help Brother Chen at school."
By the time they were seventeen,
Song Jiayu was indeed pretty good to Chen Ran.
When Chen Ran got into trouble, she took the blame. When he got into a fight, she kept watch. When he skipped class, she covered for him. She was practically his all-purpose helper.
But one day, Chen Ran suddenly made a request she couldn't fulfill:
Fall in love with him.
A lighthearted, sweet romance
"I've always thought of you as the person who saved my life, and you want to hit on me?"
"That's right."
Theme: I haven't thought of one yet.