Cheng Cheng met Si Nan in high school. Si Nan was very clean and looked very polite with his glasses, but in fact he was a bit naughty. Such a person has very good grades. He doesn't seem to care about anyone, but Cheng Cheng is an exception.
Cheng Cheng is an optimistic girl who works hard, both in her studies and in love with Simon. She loves Simon very much.
But Cheng Cheng never dreamed that one day Si Nan would leave quietly without leaving a word, and even changed his contact information so that no one could find him.