Infinity Train - Book Four: Duet

Childhood friends with opposing personalities, Mingi and Ryan, dream of becoming rock stars but find themselves on the Infinity Train. They explore the locomotive's inner puzzles — and their own relationship — in order to return home, together.

10 Episodes

The Twin Tapes

Season 4 - Episode 1

Once great friends, Ryan and Min-Gi's relationship slowly dissolves over the course of years of disgruntlement, culminating with their reuni...

The Iceberg Car

Season 4 - Episode 2

Waking up on the train together, Ryan and Min-Gi are met by Kez, whose mistake has left the boys in a predicament.

The Old West Car

Season 4 - Episode 3

Arriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.

The Pig Baby Car

Season 4 - Episode 4

Ryan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.

The Astro Queue Car

Season 4 - Episode 5

With a growing rift forming between them, Ryan and Min-Gi attempt to convince a bouncer to let them enter the rave.

The Party Car

Season 4 - Episode 6

With their instruments back, Ryan and Min-Gi have to play their first show since they were kids, but it's no easy emotional feat.

The Art Gallery Car

Season 4 - Episode 7

The boys' disintegrating relationship finally comes to a head when they end up in a haunted art museum with seemingly no exit.

The Mega Maze Car

Season 4 - Episode 8

As the duo nears Kez's home, they are forced to contend both with all their enemies and their messy relationship.

The Castle Car

Season 4 - Episode 9

Having finally arrived at Kez's home, Ryan and Min-Gi learn of her biggest secret and regret.

The Train to Nowhere

Season 4 - Episode 10

Ryan and Min-Gi are forced to face the truth and a final challenge if they ever want to go home.