'Know' would be a strong word. I have an RL friend who's into them and has shown me a couple of videos, so I'm aware that they're a very pretty K-Pop band with ridiculous hair.

Monster intrigues me, though. So many unanswered questions! Are they mutants? Did they get their powers from an evil plot to create genetically enhanced boybands? Why do people who seem to be in a prison look like they have access to a small army of personal stylists? Do they run away to join the X-Men at the end? Do they bring the stylists with them?