Just watch the video~!

and then you'll know what I'm taking about.

f(x) & EXO-K attended the I AM screening premiere with a couple other SMTOWN ARTISTS.

Sulli didn't attend, I don't why. But there is Kai & Krystal in the same room.

http://www.youtube.com/watch?v=3K3OWi1y0Pw

at about 4:01, you can see Krystal and Amber giggling as EXO-K does their "Anneonghaseyo, WE ARE ONE, EXO-K imnida!" speech.

so cute ^^