After a brief hiatus and immense teasing over the past week, Big Bang has returned to the scene with their 4.5 repackaged album and are beginning promotions once more on tonight's Mnet's M! Countdown. Their two title tracks for the album, "Love Song" and "Stupid Liar", were co-produced by G-Dragon and Teddy. Both "Love Song" and "Stupid Liar" deliver a catchy, electronic rhythm with a unique modern rock feel that is sure to set off another trend in the K-pop industry. Check out their double-song performance below!