https://www.mangago.me/read-manga/a_trace_of_the_wonder/
https://www.mangago.me/read-manga/little_mushroom/
https://www.mangago.me/read-manga/hotel_phryne/
https://www.mangago.me/read-manga/merry_memory/
Not sure if they'll meet your criteria but do check them out
Woah thanks!
most fantasy/historical BLs adapted from danmei will give you world building. try "global examination"
I read a lot of danmeis so.. I read GE too..
I need BL that got a good worldbuilding/weirdly unique/different like dazzling breath, sunnyside daycare classmates, and grasp/scrap paper. Also please dont recommend the popular one bcs i already read most of it, i picked these titles bcs its my fav one.