December 2020. The coronavirus pandemic forces citizens to self-isolate, causing severe damage to small businesses. After trusting fraudulent loan sharks who promised a low-interest rate, the café owner faces aggressive debt collectors. Her establishment is destroyed, her debt grows exponentially, and her son, a boxer and former Marine, receives a scar that covers half of his face. Together with a friend, he manages to find employment with a former loan shark who now provides interest-free loans for medical treatment. Thanks to the kindness of his new boss, Kon-u pays off his mother's debts, but he remains determined to seek revenge...