When Ji-won, a 37-year-old cancer patient, walks in on her husband and best friend, she realizes her whole life has been a lie. What’s worse, she dies a tragic death at the hands of her husband. Would things have been different if she had made different choices? Fortunately for Ji-won, she is given the chance to rewrite her fate when she is reincarnated as her younger self. This time, she vows to live a happy life. But first comes revenge. Her plan? To marry off her now former best friend to her lying, cheating husband.
Episode 1
Ji-won's trust in friend Su-min shatters when she learns of affair with husband. Dying of cancer, she overhears them planning for her death payment. Unable to live final days, she's murdered. But then she suddenly wakes up, and it's 2013.
Episode 2
Ji-won goes back 10 years in time and discovers that fate rules events. She tries to hand over her destiny to Su-min by introducing her to her future husband Park Min-hwan.
Episode 3
Ji-hyuk becomes involved in Ji-won's life despite no prior connection. Su-min invites Ji-won to a school reunion to relive traumatic high school memories. Ji-won sees Su-min's motivations, transforming herself with the help of a colleague.
Episode 4
Ji-won attends a party with Ji-hyeok. At a school reunion, Su-min grows fixated on Ji-won after a tense meeting.
Episode 5
Ji-hyuk reminisces about meeting Ji-won years ago. Now his purpose is reconnecting with Ji-won. Su-min manipulates Mr. Kim to take Ji-won's proposal.
Episode 6
Ji-hyuk reveals his feelings for Ji-won, but she is worried about resisting her fate. As forces oppose Ji-won's fate, her name disappears from the proposal.
Episode 7
Ji-won has a picnic with her friends before leaving them. She then reunites with Ji-hyuk, who is worried about the realities of time travel that he learned too late. Ji-won seems to be at peace, while Ji-hyuk is struggling.
Episode 8
Ji-won and Su-min, rivals at a company workshop, have an intense battle of wits with a heart-to-heart confrontation. Su-min tries to hurt Ji-won's feelings. There is an incident with Min-hwan at a supermarket tasting.
Episode 9
Min-hwan proposes to Ji-won with Ji-hyuk's help. Ji-won spreads rumors at work. Su-min tries to turn Min-hwan and Ji-won's mother into enemies to ruin the engagement dinner. The long-awaited dinner arrives.
Episode 10
Min-hwan's engagement dinner is ruined when Ji-won shows up, leaving him embarrassed. Gossip says that the engagement was called off due to Min-hwan's cheating on Su-min.
Episode 11
Ji-won relentlessly chases him as he brakes. He opens up and they share a kiss. Meanwhile, Su-min and Min-hwan rush their wedding plans due to a surprise pregnancy.
Episode 12
Ji-hyuk's fiancée shows up, causing conflict with Ji-won. Ji-won learns that Ju-ran has cancer, which he did not pass on to his daughter Su-min. Newlyweds Su-min and Min-hwan learn some annoying information about Ji-hyuk.
Episode 13
After Ji-hyuk falls into a coma due to an accident meant for Ji-won, she discovers the truth behind it. Afraid that he won't wake up, she confronts Su-min with the memories of their shared past.
Episode 14
After an accident, Ji-hyuk awakens, follows the party Yu-ra is hiding. Ji-won believes getting Min-hwan to cheat will pass her fate to Su-min. She becomes Min-hwan's secret lover, fakes a breakup with Ji-hyuk and reconnects with Min-hwan.
Episode 15
Su-min has evidence for Yu-ra, who decides to solve things. Ji-won and Ji-hyuk make final moves toward Min-hwan and Su-min, leading to the climax.
Episode 16
Ji-won receives an invitation to Chairman Yu's house and plans the future with Ji-hyuk. Just as they are getting closer to happiness, Su-min, who has been missing since Min-hwan's death, reappears, completing their tragic fate.
