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.
Yu Ji-hyuk had no connections with Ji-won in her previous life, but he is gradually becoming involved in her current life. Su-min invites Ji-won to a school reunion to resurrect the shameful memories of when she was ostracized in high school. Ji-won sees through Su-min's intentions, and with the help of her colleagues, she undergoes a transformation.