"What I saw that day made me sick in my stomach", Hee Yeon Lim, 26, said, according to the Mirror.
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. A gun was sacked, the noise was deafening, absolutely terrifying. Their bodies were blown to bits, totally destroyed, blood and bits flying everywhere.
Hee Yeon fled North Korea with her mother and younger brother to South Korea after the death of her father Wui Yeon Lim, who died of alcohol problems.
Public executions, alongside torture, forced labor, and arbitrary arrest are used to maintain an environment of fear and control, according to the a 2017 report by Human Rights Watch.
"When they brainwash students in North Korea they say: "We can read your words, actions and thoughts, '" Hak said".
There are reports of executions in schoolyards.
Hee said that Kim likes "Bird's Nest Soup" the most.
"Everybody in Pyongyang openly supports Kim Jong Un because they would be killed if they didn't", she said.
Hee Yeon's family lived in a three-bedroom, detached state home.
Her claims come as global pressure mounts against Kim's regime following its refusal to stop nuclear and missile tests. "Although they are theoretically entitled to a salary, they usually are not compensated". This week, South Korea reported a recent 12.7 percent decrease in the number of defectors leaving the North to the South between January and August of this year, with 780 fleeing compared to 1,417 throughout 2016.
She told the Daily Mirror: "Officials came to our schools and picked out teenage girls to work at one of his "hundreds" of homes around Pyongyang".
What is more, despite the poverty that the 25 million or so North Koreans live in, Kim apparently hides out in "exquisite bolt-holes" which come with swimming pools, attractive gardens and fountains. Yes, they have to sleep with him and they cannot make a mistake or object because they could very easily simply disappear'.
She said: "They learn to serve him food like caviar and extremely rare delicacies".
Hee Yeon - whose real name has not been revealed to protect her identity - also alleged that the North Korean leader would choose teenage classmates to become his sex slaves.
The narrated experiences so far is just a little fragment of the insanity of the North Korean leader.
That illusion was shattered when she met Kim at the large-scale events said.
A shocking US Government study, published last month, found Kim is executing North Koreans "in growing numbers as the population no longer view him as a living God".
Last month, Pyongyang threatened to fire missiles towards Guam which is home to three United States military bases.
But Kim is ratcheting up the prospect of war not from a position of power, but because of his own sense of insecurity, said Hee.