An old friend

A reinterpretation of the famous book "Phantom of The Opera" tells the story of Jisung, barely moved in as the main singer that catches everyone's eyes with his sweet powerful voice. However, starting from his first night he notices a huge mirror in his room and things start getting creepy. From things moving to the feeling of someone watching him, he goes for help and finds out the legend of a ghost haunting and killing around. Jisung gets rather curious and in a moment of weakness he begs the ghost to help him perform on stage. And that's when they start to link and their souls begin to collide.