!@?

i dont remember the name of the manhwa but the boy had crush on his PE teacher, was bullied by his classmates and tried to kill himself but our mc's soul enters his body, PE teacher and mc were classmates in school

its a straight one where mc and her bf had been in a relationship for years but the bf's feelings change/takes mc for granted and he starts developing feelings for another girl, mc breaks up with him and we've our new ml (which is not the dumbass ex bf) now the ex regrets it when he realises that mc never demanded anything but the new gf does demand branded things even when he's not that rich himself and that mc is a better match for him and he took her for granted then he starts chasing the mc again but mc doesn't go back to him