Because this song is amazing. It's absolutely magical. The stage and the pale pink dresses only add to the effect. And despite Gyuri's lisp, despite KARA's overall inability to perform well live (well alright, mostly Hara {remember this?}), despite Nicole's terrible attempt at being a rapper; despite KARA's many flaws, they are the only Kpop girl group where every member is attractive. Chew on that, but try as you might, you won't find an exception. Not one.
But enough fanwar fuel. Regardless of whether they're lip-syncing or not (I really can't tell this time), the performance was undeniably entertaining. What is the use of talent if you can't be entertaining? KARA has found their niche in Japan, and I'm glad for it.