My Boyfriend Is in the Black Box

Qiao Yingfu received an adulthood gift from his mother, who had been missing for many years.

A key that opened the basement.

The old house his family lived in had four floors and over a hundred rooms. Many of them had been sealed off, and when Qiao Yingfu was a child, he loved exploring the house.

But after all those years of exploring, he had never known that his home even had a basement.

P.S.

Split-personality bottom x jealous top, one-on-one, happy ending