Return of the Frozen Player

5 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.
And then 25 years passed…
“A second floor? It didn’t end when the Frost Queen died?”
Specter awakes from his slumber.