Liu Yinghai was stuck in the quagmire of the evil of human nature throughout his middle school years, but because he wanted to face his past self, he chose to return to school, where he met his only friend from back then.
Jiang Yunxi, a female high school student who is very poor in mathematics, accidentally broke into the summer of top student Liu Yinghai. Ten years later, they reunited after a long separation and spent many summers together.
Mathematics teacher
Intention: I have always missed the secret and fleeting happiness ten years ago, but now, this is happiness that can be achieved.