Trying to find this one webtoon/manga???

Tw// suicide?? It was a regression manga from as long as I remember where the plotline had girl s best friend marry her crush and the girl ends up committing suicide but returns back to her life before meeting that girl now she changes her style and everything and the main lead is now a guy who was supposed to be dead because of a snake bite but she saves him so he is alive in this life time (he has black hair)do anyone know anything about this manga I've been trying to find it from years now