My Ex-Husband is 18

Centers on the female lead traveling back 10 years to her high school days to get revenge on her ex-husband. She reincarnates thinking the male lead is the one who got her killed and swears she won't love him again, but yeah, like that's ever as easy as you think. She resolves to love again AND get her revenge, then learns it was all a misunderstanding, and on top of the conflict with the ex there's an intriguing new male lead too, so you get a love triangle. Honestly pretty fun.