Summary
There’s a quiet rural village where laughter never ceases, even from the children and white-haired elders. It’s the small piano academy run by the village’s young head.
When the academy closes and night deepens, the head and the director start picking up various murder weapons hidden in the academy’s secret warehouse, one by one.
A gang boss who abandoned the organization and fled, and the undercover cop monitoring him that’s their true identity, unknown to anyone in the village.