第 4 季 共 10 集
播出时间：2021年4月16日
第 1 集 The Twin Tapes
播出时间：2021年4月16日
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.
第 2 集 The Iceberg Car
播出时间：2021年4月16日
Waking up on the train together, Ryan and Min-Gi are met by Kez, whose mistake has left the boys in a predicament.
第 3 集 The Old West Car
播出时间：2021年4月16日
Arriving in a Wild West town, Ryan, Min-Gi, and Kez attempt to escape the locals.
第 4 集 The Pig Baby Car
播出时间：2021年4月16日
Ryan and Min-Gi are forced to satisfy Pig Baby with the perfect dessert.
第 5 集 The Astro Queue Car
播出时间：2021年4月16日
With a growing rift forming between them, Ryan and Min-Gi attempt to convince a bouncer to let them enter the rave.
第 6 集 The Party Car
播出时间：2021年4月16日
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.
第 7 集 The Art Gallery Car
播出时间：2021年4月16日
The boys' disintegrating relationship finally comes to a head when they end up in a haunted art museum with seemingly no exit.
第 8 集 The Mega Maze Car
播出时间：2021年4月16日
As the duo nears Kez's home, they are forced to contend both with all their enemies and their messy relationship.
第 9 集 The Castle Car
播出时间：2021年4月16日
Having finally arrived at Kez's home, Ryan and Min-Gi learn of her biggest secret and regret.
第 10 集 The Train to Nowhere
播出时间：2021年4月16日
Ryan and Min-Gi are forced to face the truth and a final challenge if they ever want to go home.
