South Korean pop culture threatens the Northern regime's control and ideology. The vibrant fashion, music, and slang represent a stark contrast to a strict, state-controlled culture. Pyongyang fears that exposure to an affluent and free lifestyle could inspire discontent and admiration among its citizens, undermining the regime's authority. With the North in dire economic straits, any foreign influence could erode the regime's legitimacy and ideological grip on its people.
There's no evidence that Pyongyang carried out the execution of the young man, as the South claims. What is known for sure is that South Korean pop culture has troublesome issues beneath its glamorous surface. For instance, the K-pop industry is riddled with mistreatment, exploitation, and abuse, including slave-like contracts and sexual harassment. When North Korea fights against the dissemination of such content, it's also taking a stance against all these problems.