I like it too. But for every time I listen to it, the more obvious Jessicas lines are to me.
What do you guys think? Here's the lyrics with each of the girls parts in brackets, but I bolded the parts I think belongs to Jess originally.
ALSO, the more I look at the vid, the more intense Sooyoungs smile becomes. She is CONSTANTLY smiling and looking soo intensely into the camera. While Sunny just seems completely out of it, especially in the Japanese ver. Doesnt seem like she wants to be there.