What do you do when you find out your first love has cheated on you? You dump his sorry behind and move out, of course! And what do you do when his sorry behind moves into the building one floor below your new apartment? That’s… a little less obvious. Unfortunately, Siwon will have to answer that question for himself when his velvet-toned, voice-actor ex has discovered a new way to get under his skin... and under his home!