Over a week ago, Sơn Tùng M-TP suddenly posted an old demo called “Một Mình Cô Đơn” which he had introduced in 2012. Many audiences are now wondering whether he will produce a full MV of the demo or he just wanted to relive the past. https://www.youtube.com/watch?v=OT2br-NNdZ0 If you are his fan, you can easily recognize that the demo is a little bit different from a previous demo in 2012. The melody in the demo...