This Wasn't My Plan manhwa, This Isn't It, This is a R-12. Kim Ro-ah is the manager for the famous actor, Chen Sih-Yeon, who mistreats her. When fatigue hits due to overwork, Ro-ah gets into an accident and dies. In her dying moment filled with revenge, she swears if she could return to the past she would trample all over Sih-Yeon to prevent him from becoming famous. It turns out that she actually did return to the past, just in time before Sih-Yeon is about to make his debut. Ro-ah tries to sabotage Sih-Yeon's career, however her plan is not turning out as smoothly as she expects it to be.