Sunnyside Kindergarten Classmate

not rly a bl (imo) but lots of worldbuilding and it has gore
https://www.mangago.zone/read-manga/madk/

post apocalyptic, supernatural, action, tw: the ml rapes the mc at the beginning of the story for literally no reason just skip that chapter
https://www.mangago.zone/read-manga/radio_storm/

mystery, drama, action, great worldbuilding despite taking place in modern day + it has a great unique cast of characters (bonus points cuz its my fav lol)
https://www.mangago.zone/read-manga/sangyang_the_wanderer/

historical, mystery, rly good worldbuilding again
https://www.mangago.zone/read-manga/count_tachibana/

action, hunterverse
https://www.mangago.zone/read-manga/death_delayed_for_a_short_time_because_of_the_will/

historical, ft lots of religious themes except in this universe god is actually real, focuses mostly on political scheming
https://www.mangago.zone/read-manga/stigmata_1/

historical, drama, heavy emphasis on the world and side characters
https://www.mangago.zone/read-manga/beauty_and_the_west_chamber/

wild west, it doesnt explain much abt the world cuz its so short but its rly good
https://www.mangago.zone/read-manga/dead_or_alive/