She later claimed that Jong-un threatens war because he "feels concerned" and has "no escape". She claims to have witnessed a horrific mass execution of eleven teenage musicians who were convicted of making porn.
She had a life of privilege before fleeing the country, thanks to her father Colonel Wui Yeon Lim, Korean People's Army.
The Sun reports Hee Yeon Lim, 26, the daughter of a high-ranking soldier from Pyongyang, fled to South Korea previous year and has told of the horrors she witnessed while part of the secretive Kim regime's inner circle.
Now in South Korea, Hee Yeon has told of the horrors she had witnessed while being part of the secretive Kim regime's inner circle. She led a relatively affluent life in Pyongyang with her family. Hee Yeon Lim, whose father was a senior officer under the dictator, said she saw musicians executed and classmates turned into sex slaves.
"You can be killed for the slightest thing like disloyalty".
She described to the Mirror how officials went to schools and selected teenage girls, choosing "the prettiest" and ensuring they have "straight, good legs".
'They are taught how to massage him and they become sex slaves. If the girls object or make a mistake, she stated, they could "very easily simply disappear". Kim is married to Ri Sol-ju, and they are believed to have three children together.
But relations appear to have improved, particularly if the latest dialogue between the crown prince of the southern state of Johor and North Korean officials is anything to go by.
When the rest of the world are provided with rare videos of soldier marching in Pyongyang, they may not be seeing actual soldiers. One word against Kim Jong-un, or his father Kim Jong-il, or even his grandfather Kim Il-sung, can result in a lifetime of misery.
She added: 'The musicians were brought out, tied up, hooded and apparently gagged, so they could not make a noise, not beg for mercy or even scream.
'There were around 10,000 people ordered to watch that day and I was standing 200 feet from these victims'. A gun was sacked, the noise was deafening, absolutely terrifying, and the guns were fired one after the other.
At around the same time, South Korea's Chosun Ilbo magazine also reported the execution of a dozen musicians, saying this included Kim's ex-lover and singer Hyon Song-wol. "Their bodies were blown to bits, totally destroyed, blood and bits flying everywhere".
Left feeling "desperately ill" after the grim spectacle, she later made a decision to escape the country. She said, "I had to escape but he knows he can not do that".
The Institute for National Security Strategy - a South Korean think tank - released "The misgoverning of Kim Jong-un's five years in power" detailing how he uses executions to tighten his grip on power.