In this viral video, Choi Sung-Bong, a finalist on Korea's Got Talent gives a background story that is astonishing.
His story is generally accepted as factual even without references (for instance, on Wikipedia). I'd like to see some references which back him up.
I'm specifically interested in the bit about him running away from the orphanage at the age of 5 (after which he allegedly survived for many years by selling gum on the street).