I was on board with this before I even saw the teaser. After Hyomin's appalling 'Nice Body' promotions, any song which promotes a healthier attitude to weight and weight management automatically gets my stamp of approval.
In Korea, the pressure to lose weight and conform to society's ideals of stick-thin beauty is especially high so I can't tell you how refreshing it is to have a band (and a male duo at that!) to come out and take a stand against that.
While I doubt that the song itself will change much, even if one girl after listening to this song decides to just love herself for who she is and expects others to do the same, then it's a success.