When a retired assassin is brutally murdered, his five adopted sons, each a master of a different martial discipline, reunite with a singular, bloody purpose: vengeance. This gritty action-thriller from director Lo Wei assembles a formidable cast including Chang Yi, Elliot Ngok Wah, and Chin Han as the brothers who must navigate a shadowy world of betrayal and hidden agendas. Their quest for justice pits them against a mysterious syndicate and forces them to confront secrets from their own past, testing the bonds of their brotherhood. With a tense atmosphere of mystery and relentless fight choreography featuring talents like Sammo Hung Kam-Bo, the brothers' investigation becomes a dangerous game where every clue unveils a deeper conspiracy and trust is the most fragile weapon of all.