My initiation into the “KPop Demon Hunters” phenomenon came while traveling on vacation in Taiwan, courtesy of my 19-year-old niece, Sienna. “Sorry, but you have to watch this if you want to stay part of my family,” she announced, before clicking the link at the top of her “recently watched” list. Both I and my 21-year-old son feebly protested that we “weren’t really in the demo” for the movie, but to no avail.