I see what you are saying.
That stuff was extremely popular then. South Korea has been held back from popular culture for decades and this is where their current level of what is cool to them, is. 1970s type Japan stuff. It’s acceptable because it’s very very tame compared to what current pop culture is now.
It’s kind of the joke about canadians in the 1990s looking like we did in 1983, because the 80s didn’t come to Canada until about 1996.