They studied what made Elvis famous at an evo bio level and turned the dial up to make even more money on their product. South Korea then studied what America did and turned the dial up even further. The entertainment industry and psychology are inseperable, because the customer is the one with the money, and to serve that customer they have to know what works which often the customer doesn't even know. This is actually why Hollywood movies suck lately... they figured out the formula for maximum profits which not surprisingly due to the bell curve means sophisticated and intelligent movies aren't as popular as the new superhero wizbang movie. Any inferences as to the cultural effect of the entertainment industry is secondary and likely not causative but usually reflective of the creator's own premises and biases, the primary motivation is always profit. But the latest Jurassic Park movie with the Slovenian character at the dinosaur auction was an obvious influence campaign against Trump and came out of Left field since that country is not known for that character's job title.