This Wasn't My Plan 

In a twist of fate, Ro-A finds herself thrown back a decade in time. This isn't just a trip down memory lane. She's faced with a younger, naive Si-Hyeon, the future superstar who would brutally wrong her. Armed with knowledge of what's to come, Ro-A sees a golden opportunity: a chance to rewrite their history. Can she resist the allure of revenge and change Si-Hyeon's destiny before he becomes her nightmare? (Source: WEBTOONS, edited) Note: Part of YLAB's Red String Universe.