Episode guide
Infinity Train: Book Four: Duet
10 episodes · first aired Apr 15, 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.
- 1 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.
- 2 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.
- 3 The Old West Car Apr 15, 2021 · 11m Arriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.
- 4 The Pig Baby Car Apr 15, 2021 · 11m Ryan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.
- 5 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.
- 6 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.
- 7 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.
- 8 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.
- 9 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.
- 10 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.