Return of the Frozen Player

Five years since the world changed. The final boss has appeared. [The final boss of the Earth Area, the Frost Queen, has appeared.] The final boss! If we defeat her, we can live like we used to! Humanity's best player, Seo Jun-ho, the Dusk, and four other players finally defeat the Frost Queen, but... They had to pay a harsh price, falling into a long slumber. 25 years later. "The second floor? Wasn't it supposed to be over after killing the Frost Queen?" The Dusk has awakened.