Tell Me was the biggest dance hit in South Korea for 2007. Lots of people have videos of them dancing to it on YouTube and stuff. I read somewhere that an interview of 200 and something people in South Korea, 180+ knew about the song and 120+ could dance parts of it and at 60+ could dance the whole thing. So I reckon it is an actually copy of the Tell Me dance.
Example :3
^ That's more of an official one though. There are more home-made videos too o: