The boys are in a bus ride that seems to never end. Maybe it doesn't really have an ending. All Jeongguk knows is that he has to make sure everyone manages to get going forward in time and not backwards. He has to make sure he can get out of that nightmare.  or Jeongguk is potentially stuck in a time loop and Taehyung is the reason he doesn't give up. I'm bad at summaries. Please, give it a try.

"When Yoongi grabbed his plastic bowl to pour milk and cereal in it, he gasped as he heard footsteps next to him. “Oh, Taehyung! I thought you went out with the others.” Yoongi turned around, looking at the younger one who seemed sad."