As the deceased soul Ja-hong and his three afterlife guardians prepare for their remaining trials for reincarnation, the guardians soon come face to face with the truth of their tragic time on Earth 1,000 years earlier.

An undercover cop has his loyalties tested when the boss of the corporate gang he's spent years infiltrating dies.

When a zombie virus pushes Korea into a state of emergency, those trapped on an express train to Busan must fight for their own survival.