
But yknow its kind of weird how no one questioned about the 29th floor... Like why mc choose that story for their floor even though it's doesn't looks like it has benefit for them. Or where's this white haired dude came from? Isn't he just suddenly appeared in their eyes?

Y'all seem to forget that while the 29th floor looks like a school setting that might exist in the MC's world, it is actually a completely different world. So by adding it as a floor you not only get the educational system the tower needs to function as a proper society, you also get the entire knowledge base of this new world along with the researchers and facilities to expand upon it. Also, just think of how many hospitals are affiliated with universities in the real world, then expand that for every field of study. The agricultural science alone is priceless considering they have a food shortage.
I remember I really like this years ago, glad I found it again