Responses

Most cases of amnesia caused by head injuries don't last long-term, but because he drowned in alcohol to keep from remembering at all, it altered his brain to where he was pretty much unable to recall his memories. If he hadn't started drinking his amnesia would likely go away, but because he became an alcoholic it didn't. That's what I was trying to say, maybe it didn't come off right.
Maybe he was a doctor before he became alcoholic, that's why his name is Dokgo since he is Doctor Go?????!