The heroine suffered from depression due to family reasons. She was wrongly accused in high school, which led to campus bullying, and she eventually died in the most beautiful river.
The male protagonist fell in love with the female protagonist when they were in junior high school. They were admitted to the same high school. The male protagonist thought that the female protagonist did not like her. At the same time, the male protagonist was notified by the school that he had the opportunity to study abroad because of his excellent grades. When she came back, the female protagonist had passed away for a year. He returned home and opened the mailbox that he and the female protagonist had decorated before. There was a letter in it, which the female protagonist left for him. After reading the letter, he looked for the female protagonist like crazy. At the end of the story, the male protagonist never married and she never married.
Intention: next time and the next time we fall in love.