The plot follows a former soldier who is sent along with a team to retrieve a truck full of money from the wastelands of South Korea, now inhabited by zombies, rogue militia, and a family.

ROKMC officer Jung-seok drives his sister, her husband Chul-min, and their young son Dong-hwan to an evacuation ship.

Jung-seok's sister refuses to leave Dong-hwan, and he is forced to close off the infested cabin as zombies bite her, preventing Chul-min from entering as armed soldiers arrive.

Four years later in Hong Kong, a guilt-ridden Jung-seok, Chul-min, and two other Koreans are recruited by Chinese mobsters to return to South Korea and retrieve a truck containing US$20 million; if successful, they will supposedly receive half of the money.

On their way back to Incheon Port, the team is ambushed by a militia squad led by Sergeant Hwang, causing their vehicles to crash.

While holding Private Kim at gunpoint, Jung-seok learns that Chul-min is alive, and interrupts an ongoing survival game to rescue him, killing numerous zombies and Unit 631 soldiers.

Through strategic maneuvers, the family and Jung-seok manage to disable the pursuing vehicles, killing Hwang as he is overrun by zombies.

As he dies, Seo reverses the truck to deliberately keep the hatch open, allowing zombies outside to swarm the ship and kill all the mobsters.

Jung-seok, Min-jung, her daughters, and the U.N. troops safely board the helicopter and leave the peninsula, finally escaping the outbreak.

[9] It was theatrically released in South Korea on 15 July 2020, and was also shown in the Panorama section of the 25th Busan International Film Festival on 21 October 2020.

[14] In the United Kingdom, it was 2020's fourth best-selling foreign language film on physical home video formats (below Parasite, Weathering with You, and Mulan: Legendary Warrior).

The website's critics consensus reads: "Although a disappointing sense of familiarity threatens to derail Train to Busan Presents: Peninsula, fans of the original may find it a thrilling enough ride.