Ruan Nian had a crush on Song Xingchuan, who was two years older than him, for 6 years, but learned that Song Xingchuan had someone he liked. Ruan Nian buried an iron box under the plane tree on the street of the school that year, and would write a paragraph in it every year. In the end, Ruan Nian suffered from depression and failed to overcome the disease. He died in the hospital a year after Song Xingchuan got married.
Purpose: Want to write about secret love