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.

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E1. The Twin Tapes

Apr 15, 2021 · 11m

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.

E2. The Iceberg Car

Apr 15, 2021 · 11m

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

E3. The Old West Car

Apr 15, 2021 · 11m

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

E4. The Pig Baby Car

Apr 15, 2021 · 11m

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

E5. The Astro Queue Car

Apr 15, 2021 · 11m

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

E6. The Party Car

Apr 15, 2021 · 11m

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.

E7. The Art Gallery Car

Apr 15, 2021 · 11m

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

E8. The Mega Maze Car

Apr 15, 2021 · 11m

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

E9. The Castle Car

Apr 15, 2021 · 11m

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

E10. The Train to Nowhere

Apr 15, 2021 · 11m

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