Synopsis:  One day Kyungsoo had found a door in his musical classroom that he never been notice before. Kyungsoo go through it and finds himself in the other musical room in opposite version. He then befriend with Luhan which was inhabited at that ‘place’. Whenever Luhan leave Kyungsoo alone at that room, he would hear someone singing with nonsense language which was actually the voice of the souls that give him messages and seek for help. In the same time, Kyu