Book Four: Duet (2021)
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.
Episodes: 10
Star Cast: Johnny Young , Sekai Murashige ,
Episodes List
Ep.1 The Twin Tapes
Air Date: 2021-04-15
Once great friends, Ryan and Min-Gi's relationship slowly dissolves over the course of years of disgruntlement, culminating with their reunion in the restaurant.
Ep.2 The Iceberg Car
Air Date: 2021-04-15
Waking up on the train together, Ryan and Min-Gi are met by Kez, whose mistake has left the boys in a predicament.
Ep.3 The Old West Car
Air Date: 2021-04-15
Arriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.
Ep.4 The Pig Baby Car
Air Date: 2021-04-15
Ryan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.
Ep.5 The Astro Queue Car
Air Date: 2021-04-15
With a growing rift forming between them, Ryan and Min-Gi attempt to convince a bouncer to let them enter the rave.
Ep.6 The Party Car
Air Date: 2021-04-15
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.
Ep.7 The Art Gallery Car
Air Date: 2021-04-15
The boys' disintegrating relationship finally comes to a head when they end up in a haunted art museum with seemingly no exit.
Ep.8 The Mega Maze Car
Air Date: 2021-04-15
As the duo nears Kez's home, they are forced to contend both with all their enemies and their messy relationship.
Ep.9 The Castle Car
Air Date: 2021-04-15
Having finally arrived at Kez's home, Ryan and Min-Gi learn of her biggest secret and regret.
Ep.10 The Train to Nowhere
Air Date: 2021-04-15
Ryan and Min-Gi are forced to face the truth and a final challenge if they ever want to go home.
