I want to re read the novel but I forgot the tittle. The story is simple, this is bl. Mc is got isekaied to a ml world. The ml is a hero i think, the God give him this world as a gift of being a hero i think, and mc accidentally isekaied there.
https://www.novelupdates.com/series/its-easy-to-take-care-of-a-live-in-hero/ ML lives in basically a pocket dimension called a 'little garden', MC accidentally crosses the barrier.