Kang Ji-won, a terminally ill cancer patient, is killed by her husband and best friend after she witnesses them having an affair. She wakes up 10 years before the incident and decides to seek revenge with the help of Yu Ji-hyuk, a director at the company where she works. Now, she must reclaim her fate and eliminate the trash from her life.
Ji-hyuk reminisces about his first encounter with Ji-won eight years ago. His sole purpose in coming back is now Ji-won. Su-min manipulates Mr. Kim to steal Ji-won's proposal, while Ji-hyuk tries to assist Ji-won. However, due to misunderstandings stemming from his relationship with Hui-yeon, Ji-won ends up getting angry at Ji-hyuk instead.