If you're a TikTok user, you've probably come across videos of an eccentric Asian man — with long hair, black clothes and sunglasses — leading groups wearing headphones dancing at night in public squares to classics like the 1970s hit Ma Baker by Boney M. The videos have attracted tens of millions of views with many confused people trying to figure out who this man is, and what these people are doing. The memes have become infectious, with many copying his moves and reposting videos of their own to TikTok and other social media platforms. But who is this guy?...