It will get mentioned in the main story. Spoilers ahead
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After Jaemin confesses everything and gets sentenced to 1 year in juvenile prison and when he's driven away to prison Yiheon's soul appears and kinda forgives him. And later it appears in Yiheon's bedroom while Deukpal is sleeping in Yiheon's body, they cannot communicate yet Deukpal wakes up, wants the soul to take the body, but the soul is just like 'I didn't kill myself to return to this life' and waves goodbye and vanishes.

Lol, this sekyoung guy is funny you don't get to play hero when you yourself are just a bystander, bystander and bully is not really that different you watched him suffer even though you have the capability to help, this jaemin guy is also annoying what do you mean you bully because you like him? Yuck disgusting freak, yiheon deserve a better life! Away from this crazy psychopaths