The song was pleasant and fit K.Will's voice very nicely and, while I'm not a huge K.Will fan, I thoroughly enjoyed it.
Slight mistake they made in the video: After L has killed K.Will, he's eating a half eaten ice cream cone at 2:08, at 2:16 the ice cream cone is full, at 2:20 it's half way eaten again, at 2:22 it's melting onto his hand, and then at 2:25 the ice cream cone is once again full... The girl's ice cream cone also has problems as it is mostly melted at 2:24 and then mostly full at 2:29. This is not something I'm overly picky about, but it made me laugh.
One more thing I have to add: L's legs look very long in this video, and he looks fantastic in a slim cut suit.