Tube (Movie - 2003)

Source

Synopsis

Do-jun used to be a top agent for a high-level politician. But in the course of saving him from terrorists, Do-jun loses his beloved, and what is worse, discovers that his employer is at the center of a corrupt power circle. Do-jun still bears a grudge against Ki-taek, whose crime claimed his colleagues' lives and ruined his reputation. Filled with remorse and hatred, Do-jun is now spending his days in the subway police squad. One day Ki-taek kills the mayor of Seoul and hijacks a subway train. He is out for revenge on the hypocritical and corrupt men that once were his bosses. The train, full of passengers taken hostage, runs totally out of control and the situation runs amok.