Spinach Bouquet
1995 Youth Report (roommates turn friends turn lovers and it is adorable)
My Guildmate Next Door
Half of Me (on hiatus and slowburn, I mean slow, slow)
Heesu in Class 2 (completed)
Turning (slowburn and rebirth)
High Clear (completed)
Red String Quests (hiatus)
I don't know if Our Sunny Days counts because the MC and ML became quick friends after he returned to Korea with his baby, but I highly recommend it if you just like pure sweet pureness!
Check out Unsleep, too.
It's not really friends to lovers but it is a fun read. ლ(´ڡ`ლ)
https://www.mangago.zone/read-manga/unsleep/

this is so goooooood can u give me more friends to lovers?