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.

1. 

   1. The Twin Tapes

   2021-04-15 · 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.

2. 

   2. The Iceberg Car

   2021-04-15 · 11m

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

3. 

   3. The Old West Car

   2021-04-15 · 11m

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

4. 

   4. The Pig Baby Car

   2021-04-15 · 11m

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

5. 

   5. The Astro Queue Car

   2021-04-15 · 11m

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

6. 

   6. The Party Car

   2021-04-15 · 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.

7. 

   7. The Art Gallery Car

   2021-04-15 · 11m

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

8. 

   8. The Mega Maze Car

   2021-04-15 · 11m

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

9. 

   9. The Castle Car

   2021-04-15 · 11m

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

10. 

    10. The Train to Nowhere

    2021-04-15 · 11m

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