December 2020. The coronavirus pandemic forces citizens to self-isolate, causing small businesses to suffer greatly. Having fallen for vile scammers who promised a loan at minimal interest, the cafe owner faces aggressive collectors: the establishment is trashed, the debt grows at a geometric rate, and her son, Kon-u, a boxer and a former Marine, gets a scar on his face. Together with a friend, the guy manages to land a job with a former loan shark who now provides interest-free loans for medical treatment. Thanks to the kindness of the new boss, Kon-u covers his mother's debts, but the idea of revenge does not leave him.