Looking for a BL Novel with Two Male Leads. I Read a Reverse Harem One Before, but I Switched Accounts and Forgot the Title

The protagonist seems to have transmigrated and has a younger sister. His family runs a steamed-bun shop, and his sister has an illness. Is it divided into an upper district and a lower district? The chapters all use a very unusual format. The ability in the story involves understanding the contents of a sheet of paper. At the beginning, the protagonist encounters the first male lead, a criminal.