A past student who was forced by the study group to assault Tae-yeon. His actions during the struggle contributed to the tragic events that led to Ji-yoon's death and the subsequent cover-up.
Soo-il was directly involved in the past incident that led to Tae-yeon's death.
Eun-su targets Soo-il as one of the guilty parties from the past study group.
Both were part of the same toxic study group where Se-hee was marginalized and witnessed the crime.
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