On Christmas Eve, Billy experiences a horrifying tragedy when he witnesses the brutal murder of his parents. The traumatic event shatters his childhood and leaves a deep scar on his mind. As the years pass, the painful memories twist his sense of justice and turn him into a terrifying figure who dresses as Santa Claus. Every year during the holiday season, Billy embarks on a chilling and carefully planned spree of violence, believing he is punishing those he sees as naughty or corrupt. However, this Christmas something unexpected happens. His deadly path crosses with a young woman whose kindness and courage begin to challenge the darkness that has consumed him for so long. As their connection grows, Billy is forced to confront the pain, anger, and choices that shaped his life, leading to a tense struggle between the man he has become and the humanity he might still have left.