I don't think they will believe him but i really hope that his father at least knows about it in the future
Spoilers....
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I don't think he will... reading from spoilers before, i vaguely remember that his dad just guessed where he came from and he admitted to him(?)
Only the dad and the younger self will known as far as i can remember
Oh, okay!
Spoiler
I am still reading the novel but in a few chapters he will tell them that he is a past experiment
Ooh~
Novel link please? (If it's in English)
Rip that's the wrong one
https://novelbin.com/b/ill-retire-after-saving-the-world
(*ˊᗜˋ*)ᵗᑋᵃᐢᵏ ᵞᵒᵘ
Is going to finally tell them the truth and say that he's actually the annoying brat from the future and regressed to save them from extinction!???
Or is he just going to say half the truth like...
He was actually a past expirament of theirs but not tell them about the future...?