love on hold:
https://www.mangago.me/read-manga/why_are_you_so_kind_to_everyone_except_me/
passion:
https://www.mangago.me/read-manga/passion_1/
cozy obsession:
https://www.mangago.me/read-manga/cozy_obsession/
sugar trap:
https://www.mangago.me/read-manga/sugar_trap/
kiss me liar:
https://www.mangago.me/read-manga/kiss_me_liar/
this one is toxic af/black flag galore:
https://www.mangago.me/read-manga/raising_beta_winnow/
hopefully some of these fit what you'd like!
mc is so dense, ml so possessive --
1. https://www.mangago.me/read-manga/scandalous_wedding/
2. https://www.mangago.me/read-manga/who_s_your_daddy/
mc is pretty dense, ml is pretty possessive --
3. https://www.mangago.me/read-manga/possessed_by_a_cotton_ball/
mc is not that dense just really focused on his work, ml kind of possessive in the sense that he feels that he needs to look after mc's health --
4. https://www.mangago.me/read-manga/the_affairs_of_the_other_world_depend_on_the_corporate_slave/
mc is not that dense just really young and inexperienced, ml is possessive and i think it is sort of implied why at the very end? but tbh i had nooo idea why ml liked mc so much until the later part lol, i just read it long time ago for the art xD --
5. https://www.mangago.me/read-manga/hosik_s_story/

bls with oblivious mc and possessive ml??? ok w red flags like eighteens bed but also like greener flags like creating a hidden ending