1-korea song 2-girl group 3- there is hand gesture during the dance that similar to a scene "u must be joking right" except that they use both hands to execute it. 4-there are some english words in it, i only recall the chorus "bad boy~~ be(?) bad boy~~~ babeh" more or less sounds like that. Reason: It had a catchy tune and i kinda like it. but i forgot to subscribe it and end up forgetting the song and the group name.
not SNSD. which song? i search and found that too. but it is not. nope. the dance doesnt even had (3) hand gesture. it kinda looks like waving both hands using five of ur finger.