Heartbeat (You Hu Wenhua)

A girl pressured into good behavior and a boy who has no ambitions, these two connected by a misunderstanding from a diary, leading to an interesting and stimulating game of decryption... As the emotions of adolescence germinate in this game of misunderstanding, the distance between the both of them gradually shortens, with them finding out that two completely different people are facing the same problems...

Original Webcomic