Book Four: Duet
10 episodes · 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.
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S4E1The Twin Tapes
Apr 15, 202111mOnce great friends, Ryan and Min-Gi's relationship slowly dissolves over the course of years of disgruntlement, culminating with their reunion in the restaurant.
S4E2The Iceberg Car
Apr 15, 202111mWaking up on the train together, Ryan and Min-Gi are met by Kez, whose mistake has left the boys in a predicament.
S4E3The Old West Car
Apr 15, 202111mArriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.
S4E4The Pig Baby Car
Apr 15, 202111mRyan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.
S4E5The Astro Queue Car
Apr 15, 202111mWith a growing rift forming between them, Ryan and Min-Gi attempt to convince a bouncer to let them enter the rave.
S4E6The Party Car
Apr 15, 202111mWith their instruments back, Ryan and Min-Gi have to play their first show since they were kids, but it's no easy emotional feat.
S4E7The Art Gallery Car
Apr 15, 202111mThe boys' disintegrating relationship finally comes to a head when they end up in a haunted art museum with seemingly no exit.
S4E8The Mega Maze Car
Apr 15, 202111mAs the duo nears Kez's home, they are forced to contend both with all their enemies and their messy relationship.
S4E9The Castle Car
Apr 15, 202111mHaving finally arrived at Kez's home, Ryan and Min-Gi learn of her biggest secret and regret.
S4E10The Train to Nowhere
Apr 15, 202111mRyan and Min-Gi are forced to face the truth and a final challenge if they ever want to go home.