Story
Kim Sang-an is a cold-blooded loan shark. When his younger sister, a schoolteacher, takes her own life after relentless bullying from her students, he becomes the homeroom teacher of those very students to collect the price of her life. A merciless loan shark who will collect his debts even if it means descending into hell and a class of devil-like students... A vicious, twisted teacher-student relationship.
Synopsis via AniList (English).
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