i hope some of these fit what u r saying:
(its been a while since ive read some of these)
https://www.mangago.me/read-manga/yang_il_woo_and_i/
https://www.mangago.me/read-manga/why_are_you_so_kind_to_everyone_except_me/
https://www.mangago.me/read-manga/minority_1/
https://www.mangago.me/read-manga/summer_season/
https://www.mangago.me/read-manga/what_can_t_be_broken/
https://www.mangago.me/read-manga/error_analysis_report/
https://www.mangago.me/read-manga/only_kind_to_me/
https://www.mangago.me/read-manga/reunion/
https://www.mangago.me/read-manga/kiss_me_if_you_can/
https://www.mangago.me/read-manga/semantic_error/
https://www.mangago.me/read-manga/for_your_love/
https://www.mangago.me/read-manga/form_of_sympathy/
https://www.mangago.me/read-manga/guiding_hazard/
https://www.mangago.me/read-manga/beyond_memories/
https://www.mangago.me/read-manga/abnormal_rommate/
https://www.mangago.me/read-manga/ways_of_parting/
need a slowburn manhwa/manga/manhua idc with CRAZY sexual tension where both want each other so much but not sure where the line of boundaries so they basically hold it or something like that