In this sweetly sentimental song about moving out of their trainee dorm, the boys reminisce about their days as young idols. Despite being able to to put away some of the worries of their early careers, the boys resolved not to forget these more difficult times as they moved forward. After all, these struggles are what laid the groundwork for BTS’s later success — although when this song was released in 2015, the boys still had no idea of all that they would achieve!