In that summer of 2018, a 15-year-old girl met a 16-year-old boy. From then on, a two-way secret love began. He is the only, partial, and special case in her world, and she is his own mathematical problem.
In the summer when I had a crush, there were lots of little notes, all about him/her.
"At the end of summer, I like you more than I like myself."
"Chu Qiu, you are the only answer to the math problem, and you are also the only answer to me!"
Concept: Secret love is a compulsory course for youth