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Although he thought he could get used to this kind of life, his memories from his previous life wouldn't allow him to relax. He was still thinking about his deceased parents. Every time he did, he felt heartbroken, and whenever he thought about his sister, he felt incredibly worried.
He couldn't do a single thing right now about her; he was spirited away into another world to begin with… He didn't even knew what his true purpose was here aside from being the guardian of these people. But based in what he heard before, there was some sort of destiny for him.
"(The Dragon King…)"
He recalled what the voice told him, about a "dragon king" of sorts that would protect him and help him grow stronger… But there was no other dragon here other than himself.
Check "The Protagnist's Sister Is Actually the Strongest"!