His biological mother is Korean and was born on March 21, 1964. She and her parents were originally North Korea, though they left for South Korea during the Korean War. Little is known about her except what is told by Mark himself in his Draw My Life - Markiplier video. It is known that they are in good relationships, and Markiplier usually visits her during holidays.
I'm officially done, I can't do it anymore, I'm throwing in the towel. It's insanity, insanity to even try... which is why I'm going to do it one more time. And we all know what came next.