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.
Episodes
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.
Waking up on the train together, Ryan and Min-Gi are met by Kez, whose mistake has left the boys in a predicament.
Arriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.
Ryan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.
With a growing rift forming between them, Ryan and Min-Gi attempt to convince a bouncer to let them enter the rave.
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.
The boys' disintegrating relationship finally comes to a head when they end up in a haunted art museum with seemingly no exit.
As the duo nears Kez's home, they are forced to contend both with all their enemies and their messy relationship.
Having finally arrived at Kez's home, Ryan and Min-Gi learn of her biggest secret and regret.
Ryan and Min-Gi are forced to face the truth and a final challenge if they ever want to go home.
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