@HammerU89
https://mangadex.org/title/47132/ichioku-nen-button-o-renda-shita-ore-wa-kizuitara-saikyou-ni-natteita
This one is not Korean, but compared to it 3000 years doesn't seem that much.
@kbalintz I understand your point of view, but at this point in the story he should have already known who he is, and even if he can't remember his past memories, his consciousness will still be the same, you simply don't see a man acting like a child just because he has amnesia.