Called "Pak Un" and described as the son of an employee of the North Korean embassy, Kim Jong Un is thought to have attended an English-language international school in Gümligen near Bern.

Kim Jong Un is described by former classmates as a quiet student who spent most of his time at home, but he had a sense of humor, too.

"He was funny," former classmate Marco Imhof told The Mirror. "Always good for a laugh."

"He had a sense of humor; got on well with everyone, even those pupils who came from countries that were enemies of North Korea," another former classmate told the German newspaper Welt am Sonntag. "Politics was a taboo subject at school ... we would argue about football, not politics."