Mystery Shock

Jin-Ju, who suffers from domestic violence, drifts through school life due to her dependent personality. She befriends Han Si-Yeon, and the two become incredibly close through web novels. But as time passes, Si-Yeon grows weary of Jin-Ju's dependence and says hurtful things to her. That night, Jin-Ju goes missing. Afterwards, horrific rumors about Jin-Ju's disappearance spread through school, and Si-Yun is tormented by guilt. What really happened to Jin-Ju that night...

(Source: Naver, translated)