Ji-won believed that Su-min would always have her back until she discovered that Su-min was having an affair with her husband. Ji-won, a terminally ill cancer patient, witnesses the two in bed discussing her insurance payout. She ends up not being able to live out the remaining days of her numbered life before she's killed... But then she suddenly wakes up, and it's 2013?!

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.