its a straight love coloured manhwa i dont remember if the mc transmigrated or sumn but the mc is the best friend of the og fml and they attend a medieval school together but the obsessive ml and og fml's brother who attend the same school fall in love with our mc and og fml is head over heels for mc their friendship was adorable
Idk if this one or not but it's pretty similar
https://www.mangago.zone/read-manga/i_don_t_want_to_be_a_magpie_bridge/
RANDOMLY STARTED THINKING OF THEM AND I FEEL SO FUCKING DEPRESSED SUN JING MY LESBIAN LOSER GF ILL MISS U FOREVERRRR