RECOMMENDATIONS!!!

https://www.mangago.zone/read-manga/sura_s_lover/

https://www.mangago.zone/read-manga/night_smoke_king_yacha/

https://www.mangago.zone/read-manga/my_hyung_s_lover/ (the MC is also toxic, possessive, obsessive)

https://www.mangago.zone/read-manga/sadistic_beauty_bl_sidestory/

https://www.mangago.zone/read-manga/unfinished_relationship/

https://www.mangago.zone/read-manga/form_of_broken_love/

https://www.mangago.zone/read-manga/even_if_you_don_t_love_me/

https://www.mangago.zone/read-manga/a_tree_without_roots/

https://www.mangago.zone/read-manga/into_the_thrill/

https://www.mangago.zone/read-manga/cash_or_credit/

https://www.mangago.zone/read-manga/so_the_fight_over_hyung_and_ahjussi_sikopet/

https://www.mangago.zone/read-manga/miwaku_shikake_amai_wana/

https://www.mangago.zone/read-manga/swallow_gawee/

https://www.mangago.zone/read-manga/99_9_of_lovers/

https://www.mangago.zone/read-manga/behind_the_scenes_monologue/

https://www.mangago.zone/read-manga/solo_for_two_mature/

https://www.mangago.zone/read-manga/december/ (but he’s a huge green flag towards the MC)

https://www.mangago.zone/read-manga/why_are_you_so_kind_to_everyone_except_me/

https://www.mangago.zone/read-manga/legs_which_cannot_walk/

https://www.mangago.zone/read-manga/love_jinx/

https://www.mangago.zone/read-manga/my_suha/

https://www.mangago.zone/read-manga/a_link_between_relationships/

Some of them are simply just a bit toxic, while others are pretty bad with how obsessive/possessive they are (Sura’s Beloved, A Tree Without Roots, etc.)