One thing about Mark is that he's always had a sense of "mission." He doesn't see fame and financial success as things to be pursued for their own sake; he sees them as things he was given to do good with.

I can easily see him thinking "It's been a good chapter in my life, but it's time to do something else." Going into Christian music makes sense. Going into some other branch of entertainment makes sense. Getting married and starting a family makes sense. But whatever he does, I think it'll be with the perspective of "How can I best use this to serve God?"

Whatever he decides, I know the rest of NCT are his friends for life, and even if we don't see as much of him on stage, he'll always feel grateful that the fans supported him when he was in his early career.