Kim Sang-an, a cold-blooded loan shark.
When his sister, a school teacher, takes her own life after being relentlessly tormented by her students…
He becomes their new homeroom teacher to collect the “debt” of her life.
A debt collector who would crawl into the depths of hell to get what’s owed, and students who are nothing short of demons.
A brutal “teacher-student” relationship begins now.
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