I'm also curious if his original identity are still exist or no longer exist
Me too! But from the time he became a baby, in the news it is shown there is no 'him' in this timeline. Maybe due to circumstances he didn't appear in the tv broadcast abt the wheelchair scene like maybe he's sick that day. It still hasn't mention that 'he' is not present as a child of his father. Maybe we'll see more clues in the future chapters.
I bet one of his parents is like an illegitimate child, so he’d end up being his uncle or something.
What if he's gonna adopt him HAHAHAHAHA or like gonna be his godfather or somethingggg