Train to Busan 3: REDEMPTION picks up in a world ravaged by the zombie apocalypse, where the survivors of previous battles face their most desperate hour. The story centers around Ma Dong-seok’s character, who returns as the formidable protagonist, leading a new group of survivors in their fight for survival.

The film begins with the remnants of humanity scattered across desolate landscapes, struggling to rebuild their lives. Ma Dong-seok’s character, now a hardened leader, takes charge of a group of survivors seeking refuge in an abandoned, fortified military base.

The survivors include a diverse group of individuals, each with their own motivations and skills, but all united by their shared struggle against the relentless zombie horde.

As the survivors fortify their defenses, they discover that the zombie outbreak is not merely a random event but part of a more sinister, orchestrated plan. A shadowy organization, previously hinted at in the series, is revealed to have been experimenting with bio-weapons, leading to the zombie epidemic. The survivors uncover evidence that this organization intends to release a new, more virulent strain of the virus, which would wipe out any remaining pockets of humanity.