Sony Animation has been on a bit of a heater these past few years — Into the Spider-Verse, Mitchells vs. The Machines, even (although it's not my thing) Sonic has its charm. If The Lego Movie is an A+, K-Pop Demon Hunters is a solid B+. It’s fizzy, stylish, and deeply unserious in all the right ways. The party kicks off with glow sticks and bass drops, but by the end, the lights are flickering and someone’s crying by the…