The extent to which North Koreans are actually brainwashed depends on the level to which they belong.

Loyalty is vague in the upper classes. However, the loyalty of the middle class, who is neither an executive nor a commoner, is firm and important for maintaining the government. It is this layer that performs special tasks such as spying.
(Asahi newspaper Aera editorial department, “Exiles from North Korea”)

The following is an episode about people who have loyalty implanted through North Korea’s brainwashing education.

There was a praised schoolgirl who wrote in a diary the praise of his dear leader. Her article was published in the Labor Newspaper and was awarded for loyalty. College students saw her as a weird and teased but couldn’t say blatantly. “Who is the happiest man who can marry a person like you?” This was the last rub. (Barbara Demick, Nothing to Envy:Ordinary Lives in North Korea)
Dr. Kim was cleaning up the party secretary’s room. His secretary was not good at reading and writing, and he relied on Dr. Kim, who read the Labor Newspaper and the Hambuk Ilbo and prepared his lectures.
Kim believed that his secretary would recommend joining the Labor Party. During the cleanup, I noticed that the drawer for storing the files was left open.
Opened with curiosity, there was a document listing some of the hospital workers’ names as persons requiring special monitoring. Next to each person’s name is the reason why he is considered a watchful person.
It was all about background. Parents or grandparents were Christian followers, landlords, returnees from Japan, or relatives in China.
She found her name on the list. I doubted my eyes. All actions should have been perfect. He did not pamper himself with perfectionism because of his personality. He always took the initiative in taking volunteers and attending thought education classes at the very best. The father had relatives because he came from China, but she has never met or contacted.
Eventually, the secretary knew that he had been under constant surveillance without any intention of letting Kim join the Labor Party. I felt the party officials in the hospital were keeping an eye on me.
Her suspicions were confirmed two years later, when a member of the National Security Agency came to the hospital accidentally. He has been examining whether he is planning to asylum from North Korea. When he ate why he had to abandon his country, he gave a reason. There are relatives in China. Marriage failed. No salary from hospital. (Ibid.)
His career as an elite was further boosted by the Korean War. He was assigned to the Supreme Command Special Zone as an interpreter between the military leaders and the Russian Military Advisory Group, and was spotted by Choi, who was in power at the time. Thanks to him, he was able to interact naturally with military dignitaries without any fuss. My father took pictures with Choi Yong-Ken and Russian service reporters,
I valued it like a medal of honor. Another photo is what my father is most proud of. It was a picture of himself commanding the scene with a Major’s epaulette during a POW exchange. The photo was framed and hung on the wall directly opposite Kim Il Sung’s portrait. (Zhao Ying-ho, Carrot thief)
A flyer sent from South Korea sent a message saying, “Keep Kim Jong Il! Kim Jong Il is a vicious terrorist. He brainwashes the people, squeezes their wealth, and keeps the sake pork forest every night.
It also fosters secret police to protect its dictatorship and develops missiles. In addition, it has begun violent terrorist acts around the world, including the explosion of Korean aircraft. Do not allow such domineering. Stand up, North people!送 り Send the gold simmer to the execution table and embrace the freedom! ”
And a picture of satirical Kim Jong Il and a naked joy group were drawn. At the moment I saw, I literally strangled my incisors, and didn’t know how much anger I swore for revenge.
“Kim Jong Il is the one who has come down from heaven, the sun that moves the world,” he grew up teaching when he was young.
A soldier who had just been assigned to a demilitarized zone suddenly fired at a sentry to the Korean military. He heard a slandering voice without honoring Kim Jong Il on the North Korean Broadcasting Service and unwittingly triggered him. (Ju Sung-il, North Korean People’s Army: Living Hell’s Hyoei)
Lee In-mo is a former North Korean soldier who was a prisoner of war during the Korean War and remained a long-term prisoner. He is a hero who has been demanding a release from the South Korean government as a “prisoner of conscience” by the North Korean campaign. The old soldier was recently released for the first time in 40 years as a symbol of a North-South dialogue, and returned to North Korea. (“North Korea Bad Diary”)

Loyalty is not always rewarded.

In 1984, North Korea sent rice from a flood in South Korea. Even in the factory, people who have a good home environment and can see a little effort were selected for incitement, and rice was sent out every 10 to 20 kilograms.
He raised the television to those who gave out a lot of rice, and even told him to say that he had raised his bicycle. The stupid who believed in this rumbling word, at this opportunity to gain the confidence of the party,
At home, they eat rice while eating rice porridge for the first time. They later found that there was no price for doing so. I’m just hungry. (Jang Ki-hong, “North Korea: ordinary people”)
The artillery commander and division leader went to the victim’s couple’s house with some rice and meat. What is humorous is the words of the couple at that time. First, my wife said,
“Well, that would happen,” said the husband, shrugging his face. “I can eat meat for the first time in a long time. Please eat together! Isn’t it a virtue of the Korean people to share and eat feasts?” He feared being suspected of loyalty to the nation. (Ju Song Il, op.cit.)