Kim Sang-an is a cold-blooded loan shark. He has crushed bones. He has broken spirits. He has collected debts from people who had nothing left to give. In the world of money lending, he is a predator, and he has never lost a collection.
Then his sister, a school teacher, takes her own life after being relentlessly tormented by her students. The same students she tried to help. The same students who laughed while she cried. The same students who pushed her until she had nothing left to live for.
The system does nothing. The school does nothing. The parents protect their children and call it a misunderstanding.
Kim Sang-an does nothing the system expects.
He becomes their new homeroom teacher. A loan shark standing in front of a classroom of demons. He does not carry a bat. He does not make threats. He simply informs them of a debt.
His sister’s life. Paid in full.
A debt collector who would crawl into the depths of hell to get what is owed, and students who are nothing short of monsters. They think they are untouchable. They think their parents will protect them. They have no idea what happens when a loan shark decides to collect.
A brutal “teacher-student” relationship begins now.

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