honestly the play's concept sounds p good, I wouldn't mind seeing it as another manhwa lol

Well, there is a hetero manhwa called Daytime in the Bunker lol, it's not the same plot and I haven't read it yet but it's on my WTR list since it looks interesting.

There is also a 2008 movie called City of Ember, it was based on a book and it's practically what the theater play is about, there is a society built underground and all their light is artificial, but they're suffering some blackouts and the MC discovers a way left by the original construction workers to go to the outside world, and she wants to see the real blue sky.