The Substitute 2: School's Out (1998)

Follow a mercenary turned teacher seeking vengeance for his brother's murder in a tough urban school. As he unravels the conspiracy behind the crime, the film blends action and suspense. With gritty realism and explosive sequences, the protagonist confronts both the challenges of teaching and the criminal elements within the school, delivering a thrilling narrative of justice, redemption, and the high-stakes world of undercover retribution.