mstbnny

erm I don't exactly remember how the plot went now bc its been awhile but i think it was smth like that
https://www.mangago.zone/read-manga/karasugaoka_don_t_be_shy/

how about "Ameiro Paradox"?

i dont think one was in love with the other the whole time, but can't think straight is similar. also, not a manhwa/manga, but My School President is a thai drama that's almost exactly like what you're describing

ugh that's my favorite oneee <333

i reaaaaly like this one!

kaaaay!
ill search this later
thankyouuu <3

https://www.mangago.zone/read-manga/nerd_project/
https://www.mangago.zone/read-manga/checkmate_1/
https://www.mangago.zone/read-manga/love_shuttle/
https://www.mangago.zone/read-manga/no_love_zone/
https://www.mangago.zone/read-manga/semantic_error/
https://www.mangago.zone/read-manga/there_s_something_wrong_with_my_popularity/(no smut)
https://www.mangago.zone/read-manga/you_and_i_can_t_do_this/
https://www.mangago.zone/read-manga/perfect_buddy/
mangago.zone/read-manga/secret_therapy/
https://www.mangago.zone/read-manga/nande_koigataki_ga_ki_ni_nannen/
https://www.mangago.zone/read-manga/cloud_1/
tell me if you want more (≧∀≦)

https://www.mangago.zone/read-manga/there_s_something_wrong_with_my_popularity/
https://www.mangago.zone/read-manga/secret_therapy/
the ones i wrote wrong

try The Man Who Can't Taste

Here dear Enjoy
https://www.mangago.zone/home/mangalist/2558604/

some of the titles listed are not really rival to lovers - maybe more like rival for 1 or 2 chapters only.

yeah but they're still really good bls (๑•ㅂ•)و✧