The members asked Mark how he came up with the rap segment for "Joy", in which he wrote himself.
Hearing this, Mark commented, "'Joy' is a combination of songs that have already been released. Since the original tracks carry a bright tune, I wanted to do the same for this track as well. I tried my best to portray a similar mood."
Meanwhile, NCT Dream's 'Joy' is a unique blend of popular Christmas carol "Jingle Bells" and "Joy to the World" with a fast tempo and energetic vibe.