Oh, snap; I did find the spoiler for this theory and holy snap dragon pops. You may want to sit down for this because it was such a wow factor that I couldn't stop my self! Also, just adding in extra words so if someone replies they don't see the spoiler if they didn't want to read it...
So keep scrolling if you want to see that spoiler!
He's legit the real son. His mom is that Lunamoon/Luminum and his father is the commander, but here's the kicker, that commander is the reason for a lot of things called Chaos, but he lost his memory and became a concept that eventually became the guy we see as the commander, Hayden. His mother gave him his name since he had no real name since he was never human. So he really is the real son and she was his actual mother.
Oh another spoiler on the other version of our MC the one from the Unicorn Nation~
It is him as a regressor; he wanted to escape his father [Chaos] and in order to do so he chooses to regress. So we're seeing another version of him that had lived the world differently then our MC. I'm thinking the way he played the game was how the Regressor him had lived, not 100% on that since I'd need to read the novel.
There's so many more spoilers that I'm rolling in juicy info now after checking the spoilers!

guys what if Luminum (already forgot the name of the hero lol) is the real mother of the mc and they are originally came from the game (ik that luminum is originally from the earth and a player) but got transported back to earth cause in the early chapters MC’s mom is not answering her phone and it’s suspicious how they highlighted it, thats why the effects is doubled
this is my fantasy y’all so if this have novel or sum spoil me please, why its so normal for them to be transported to the game