In the gritty world of underground fight clubs, Kid, a masked fighter known only by his gorilla mask, endures brutal beatings for survival. Haunted by childhood trauma, he seethes with suppressed anger until a chance to infiltrate the city’s elite emerges. Armed with scarred hands that hide a dark secret, Kid unleashes a vengeful onslaught against the powerful figures who have wronged him, setting off a chain of explosive events.