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After the exploration with Kireina into the Dark Labyrinth, Sol walked back to the house where Elfina, Fiere, and Floresse were. Apparently Floresse was off somewhere else, probably helping her soldiers prepare for the upcoming war, and Sol only saw a few maidservants and butlers walking around.
They offered him anything but he quickly ended walking back to his room. Aside from the strange thing that Kireina had done to the Dark Labyrinth, which was lingering in his mind, he had many other things to think about. All the things he spoke with her ended helping him realize various things and learn a lot as well. And it might had given him a new purpose, going back to Genesis, perhaps. But simply put, he had a new resolve, or perhaps, he simply realized that his resolve was always only one.
"I want to go back to my family…"
Check "The Protagonist's Sister Is Actually the Strongest"!