The Frozen Player Returns

Five years after the world changed, the final boss appeared.
[The final boss for area Earth, the Frost Queen, has appeared.] The final boss! If we can just defeat her, our lives will go back to normal!
The top five players in the world, including Specter Seo Jun-ho, finally defeated the Frost Queen…
But they fell into a deep slumber.
25 years passed.
“A second floor? It didn’t end when the Frost Queen died?
Specter awakes from his slumber.