Throughout the series, Ok Chan-mi (Shin Ye-eun) believes her twin brother, Ok Chan-kyu, was driven to suicide. But as she digs deeper into the violent world of Yongtan High, she learns he was actually murdered. The prime suspects shift from the school bully, Gi Oh-sung, to the mysterious Soo-heon (Lomon), and even to the seemingly kind teacher, Mr. Jung.
Here’s a breakdown of how it all ends. 1. The True Killer is Revealed (Finally) ending of revenge of others
Chan-mi gets her evidence and clears her brother’s name. But she realizes that revenge has cost her everything: her innocence, her school life, and nearly her future. In the final episode, she makes the mature, heartbreaking decision to . She doesn’t stay to celebrate or to watch Jae-beom rot in jail. She simply walks away, choosing healing over hatred. Throughout the series, Ok Chan-mi (Shin Ye-eun) believes
In the climactic scene, Soo-heon doesn’t kill Jae-beom outright. Instead, he orchestrates a poetic justice: he forces Jae-beom to experience the same fall that killed Chan-kyu. But at the last second, Soo-heon pulls him back—only to deliver him to the police with a full confession recorded. However, in the ensuing struggle, Soo-heon is stabbed. He survives but ends up in prison for his own acts of vigilantism. The True Killer is Revealed (Finally) Chan-mi gets
In the final episodes, the shocking truth comes out: —the quiet, unassuming police officer and the boyfriend of Chan-mi’s late brother—pushed Chan-kyu off the school rooftop. His motive? Jae-beom was the secret mastermind behind an illegal gambling and match-fixing ring involving student boxers. When Chan-kyu found out and threatened to expose him, Jae-beom silenced him permanently.
Ji Soo-heon (Lomon), a fellow student seeking revenge for his own sister’s death, has been hunting the same killer. After learning the truth, Soo-heon confronts Jae-beom in a brutal showdown. Unlike Chan-mi, who hesitates to cross the line into murder, Soo-heon has nothing left to lose.