Sang Zhi falls in love with Duan Jia Xu, a boy who often comes to her house to play games in her older brother's room. He is seven years older than her. Sang Zhi had a crush on Duan Jia Xu when she was young, but they lost contact with each other for some reason. After she graduates, she joins the university in the city he is in, and during their day-to-day intimate and close interaction, they slowly fall in love.