In the early morning of April Fool's Day on a rainy night, the picky bookstore owner Si Heng met a handsome young man who was soaked and had no memory - Gu Siyi. This mysterious man possesses the knowledge index of all mankind, but does not know how to make a warm cup of tea. Si Heng took him in, and in the "Guanli Bookstore", one taught aesthetics and life, and the other taught emotion and existence.
When Gu Siyi's life experience surfaced, Si Heng declared his guardianship in the name of "lover".
