In the mid-season finale of (Season 1, Episode 8), Moon Dong-eun’s meticulously crafted revenge plan reaches a critical turning point as the primary antagonist, Park Yeon-jin, finally begins to unravel. Episode 8 Recap: The Part 1 Finale

notes that the episode effectively sets the stage for Part 2 by highlighting how Dong-eun has successfully infiltrated every aspect of her tormentors' lives.

: Dong-eun meets Jae-jun on school grounds, where she slaps him after he provokes her. She reveals that she knows he is Ye-sol’s biological father and uses this leverage to turn him into a reluctant ally.