How Kim Jong Un treated his high-school girlfriend is the key to understanding his 'wild' temper

Kim Jong Un's chaotic temperament has been obvious for years and could be seen in how he treated his teenage sweetheart aged 15, a Korean security expert has said.

Nam Sung Wook, a former director of the Institute for National Security Strategy (INSS) think tank on inter-Korean studies, said that a story he picked up from Kim's schooldays shows how he was prone to rage as a teen.

Nam said Kim's unnamed high-school flame tried to persuade him to stop smoking and got the same kind of furious response with which the world's leaders are becoming ever more familiar.

"As Kim was smoking at a young age, his girlfriend advised him to quit smoking," Nam told a political-party conference in Seoul on Wednesday, as cited by Korea's Yonhap News.

RELATED: Everything you didn't know about Kim Jong Un

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1. While Kim Jong Un's birthday on January 8 is a national holiday, it is unknown exactly how old the North Korean leader is. It's widely believed he is in his early-mid thirties. In 2016, the U.S. Treasury Department listed his birth year as 1984 when they placed sanctions on North Korea.

 (KCNA via REUTERS)

2. Kim Jong Un is the world's youngest leader, according to the date listed by the Treasury. 

(STR/AFP/Getty Images)

3. Kim Jong Un is very passionate about basketball. He is reportedly a big fan of Michael Jordan and has a friendly relationship with Jordan's former Chicago Bulls teammate Dennis Rodman. Rodman has visited the secluded nation multiple times and even sang him "Happy Birthday" before an exhibition game in Jan. 2014. 

(REUTERS/KCNA)

4. Kim Jong Un reportedly has a love for smoking, whiskey and cheese

(KCNA/via Reuters)

5. Kim Jong Un's older half-brother Kim Jong Nam was killed in Feb. 2017 by two women who smeared VX nerve agent on his face at an airport in Kuala Lumpur. The women were arrested following his death. Many believe the hit was directed by North Korea. 

(KCNA; REUTERS)

6. Kim Jong Un has two college degrees. One is in physics from Kim il Sung University and another as an Army officer obtained from the Kim Il Sung Military University.

(KCNA/REUTERS)

7. Kim Jong Un attended boarding school in Switzerland. It is widely disputed how much time he spent at the school. Most reports say he was abroad from 1998-2000. 

(KCNA/REUTERS)

8. Kim Jong Un is the only general in the world that does not have any military experience. 

(KCNA/REUTERS)

9. He married Ri Sol Ju in 2009. The couple has at least one daughter named Ju Ae. 

(KCNA/REUTERS)

10. Kim Jong Un had his uncle Jang Song Thaek arrested and executed for treachery in 2013. 

(REUTERS/Kyodo)

11. Kim Jong Un hand selected North Korea's first all-female music group -- Moranbong Band. They made their debut in 2012. 

(ED JONES/AFP/Getty Images)

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"Then, Kim exploded with foul language, which was quite shocking [to her]."

"This rough manner he displayed made me think things would get complicated once he becomes the 'king' of the nation," he added, according to the Korea Herald.

Nam believes that Kim's personality flaws are so severe that the only way to resolve the tensions in Korea is for him to be "eliminated."

He learned about Kim's background by dispatching a research team from his think tank in 2008 to Bern, Switzerland, where the dictator-to-be attended the International School of Berne. He now works as a professor of Korean Unification, Diplomacy, and Security at Seoul’s Korea University.

It was during this trip that they were told about the putative leader's teenage temperament.

North Korea last week claimed to have developed its sixth and largest nuclear test, a hydrogen bomb that could launch thousands of miles.

"The latest development is largely attributable to Kim's wild character," he said. "If Kim is not eliminated, this issue will persist."

South Korea is establishing a special unit tasked with eliminating Kim Jong Un and other North Korean leaders, the Korea Herald reported. The task force, set to launch on December 1, is expected to work with US special units that were involved in the mission to kill Osama bin Laden.

Kim Jong Il, the current leader's father and predecessor, started grooming Jong Un as his successor after he suffered a stroke in August 2008, Yonhap said. Kim Jong Il died in December 2011.

Kim Jong Un is his father's third son and thus not an apparent heir to the Supreme Leadership.

RELATED: As tensions rise, North Korea stages mass rally

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As tensions rise, North Korea stages mass rally in Pyongyang
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As tensions rise, North Korea stages mass rally in Pyongyang
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
Servicepersons of the Ministry of People's Security met on August 10, 2017 to express full support for the Democratic People's Republic of Korea (DPRK) government statement, in this photo released on August 11, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
Servicepersons of the Ministry of People's Security met on August 10, 2017 to express full support for the Democratic People's Republic of Korea (DPRK) government statement, in this photo released on August 11, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. TPX IMAGES OF THE DAY
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
People participate in a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
People participate in a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
TOPSHOT - This picture taken on August 11, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 12, 2017 shows North Korean youths and workers and trade union members holding a rally to protest the UN Security Council's 'sanctions resolution' at the compound of the Monument to Party Founding in Pyongyang. Nearly a week ago, the UN Security Council unanimously passed fresh sanctions against Pyongyang over its weapons program, including export bans, a new punishment that could cost North Korea $1 billion a year. / AFP PHOTO / KCNA VIS KNS AND AFP PHOTO / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
This picture taken on August 11, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 12, 2017 shows North Korean youths and workers and trade union members holding a rally to protest the UN Security Council's 'sanctions resolution' at the Youth Park Open-Air theatre in Pyongyang. Nearly a week ago, the UN Security Council unanimously passed fresh sanctions against Pyongyang over its weapons program, including export bans, a new punishment that could cost North Korea $1 billion a year. / AFP PHOTO / KCNA VIS KNS AND AFP PHOTO / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
This picture taken on August 10, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 11, 2017 shows service personnel of the Ministry of People's Security at a rally in support of North Korea's stance against the US, in Pyongyang. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
This picture taken on August 10, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 11, 2017 shows service personnel of the Ministry of People's Security at a rally in support of North Korea's stance against the US, in Pyongyang. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
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But his oldest brother, Kim Jong Nam, had been living in exile, in Macau, for years, according to Reuters. He was killed this February in Kuala Lumpur, Malaysia, in a plot that US and South Korean officials believe orchestrated by Kim Jong Un's regime.

The second brother, Kim Jong Chul, was passed over because Kim Jong Il believed him "no good because he is like a little girl," according to Kim Jong Il's personal chef. Nam told the party conference that Kim Jong Chul suffered from an excess of female hormones after a car accident, according to Yonhap.

"At that time, I wished my prediction [that Kim would become Supreme Leader of North Korea] would not be right," Nam said, according to Yonhap. "Unfortunately, however, it has come true."

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