A Five-Year Love Letter Dedicated to Mr. L

I wrote love letters for five years and sent them to a person named "Liu Jiamu". But everyone said that this person did not exist. Until I woke up in the hospital, my memory was shattered. And every letter I wrote lay quietly in a strange man's drawer. He said: "I followed your letter and waited for nine years." But in my youth, was there really that boy with pink hair? Or are these five years just a monologue that no one knows? "You are the most unsolvable mystery in my medical records and the only love letter I wrote in my youth."