Lee So Hyun, a high school delinquent, learns of her absentee father's survival; with nothing left to lose after a miserable 19 years, she rents a house near her dad's place and plans to meddle in his life.

So Hyun plots out how to ruin Jae Young's happiness, deciding to get rid of the loved ones in his life; she starts to hang out with Yoon Ho more often so she can naturally bump into Bok Hee, her dad's girlfriend.

So Hyun tells Bok Hee the truth and apologizes for lying to everyone; even though Bok Hee swore to silence, So Hyun changes her plan; Jae Young suggests going on a trip together, and So Hyun decides to carry out her new plan during the trip.

After So Hyun finds out the truth about Jae Young, she regrets her actions; So Hyu goes back to Yu Mi to spit her anger out at her, but starts viewing herself as the only guilty party, and decides to disappear and leave everyone alone.