I personally liked this one a lot https://www.mangago.me/read-manga/hwanghyeon_text/
I have more but here's a few I thought of
https://www.mangago.me/read-manga/murderer_llewellyn_s_enchanting_dinner_invitation/ (doesn't really have smut but I def recommend it, the plot is really good)
https://www.mangago.me/read-manga/two_souls_1/
https://www.mangago.me/read-manga/exclusive_no_love_zone/
https://www.mangago.me/read-manga/kamisama_no_uroko/
I’m so bored of reading smut with plot bl, please rec me ur fav bl that are plot first then smut <3