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He was not normal about anything but my brain rotted on Isekai couldn't see it
Thinking about Kim Roksoo who easily accepted that he now lives in a world where monsters exist and beastmen exist and magic and stuff exists. Because he came from a world that was infested by monsters and people awakened abilities. He wasn't much fazed by it because it was basically the same just the medium to deal with them changed. It should have been the first hint for us that he did not come from the normal Korea.