You, the social animal, have traveled through time and returned to campus, and the music major in your dreams. But, this is the old industrial world with steam roaring, and you are involved in a thrilling serial death. You are a little panicked, but fortunately your phone is black. A few seconds ago, you read a mysterious text message... All kinds of exploration signs show that this wave of time travel is abnormal. Under the filthy appearance of the world, the chaotic secret history and the heterogeneous truth are slowly revealed: 'Hidden knowledge, migration , phase, ritual instrument, witness, the Lord of witnesses, this is the extraordinary path of 'the knowledgeable'; 'inspiration, composition, piano, conductor, symphony' is the sacred career of 'artist'.