Secret life of Kim Jong-un in Switzerland revealed.

Former teachers of North Korean leader Kim Jong-un have shared remarkable stories about the months his former student from Pyongyang secretly lived and studied in Switzerland.

According to the Daily Mail, North Korean leader Kim Jong-un, his older brother Kim Jong Chul, and his younger sister Kim Yo Jong attended the Liebefeld-Steinhoelzli public school in the town of Koeniz, south of Bern, Switzerland.

According to a former teacher at the school, Kim Jong Un enjoyed playing basketball, spoke German with a beautiful Bernese accent, and liked to sing the Swiss classical song 'Alperose'.

Kim Jong-un (circled) and his classmates in Switzerland.

Although no one knows exactly when Kim Jong Un arrived in Bern, the North Korean leader is believed to have visited Switzerland in 1991 when he was just 7 years old.

Officials in Koeniz acknowledge that Kim Jong-un attended Liebefeld-Steinhoelzli School from August 1998 to the fall of 2000 under the pseudonym "Pak Un".

"He enrolled under the guise of being the son of a North Korean embassy employee," a city official said.

Kim Jong-un lives in an apartment in the center of Koeniz town.

Kim Jong-un attended a class for foreign students, and after a year, he was transferred to regular classes.

Teachers at school described him as a good math student who enjoyed learning German, was sociable, diligent, and ambitious. Meanwhile, former classmates remember Kim Jong-un as a basketball enthusiast, particularly a fan of the NBA and Chicago Bulls star Michael Jordan.

The football field at the school Kim Jong-un once attended.

Kim Jong-un's advisor during his time in Switzerland was Ri Su Yong (77 years old), the former North Korean ambassador to Switzerland. He meticulously arranged Kim Jong-un's living arrangements, including security and accommodation in an apartment in the center of Koeniz.

After 22 years as ambassador to Switzerland, Ri Su Yong became North Korea's Foreign Minister until 2016.

He still holds an important position in North Korea's politburo and is considered by experts to be one of the closest confidants to the young leader; Swiss media even described him as "Kim Jong-un's Swiss foster father."

According to Vietnamnet.vn