19Th Floor Echo

Lin Wei, a girl living alone who came back from working overtime late at night, unexpectedly found a mysterious paper box tied with red rope at the door of her home on the 19th floor - it contained polished pebbles and a yellowed note that read "Don't open the window, look across the way." This strange and seemingly accidental beginning is like a pebble thrown into a calm lake, setting off a series of frightening ripples in Chenguang Community.​ Aunt Zhang, who had a regular schedule across the door, suddenly lost contact, and the coin bag hanging on the door handle disappeared; Lao Chen, who did morning exercises every day on the 17th floor, disappeared mysteriously, and the police investigation found no results; dry sycamore leaves with a crooked "19" symbol appeared on the door handle of her house one after another, and the threat of a deep male voice on the strange phone "Don't mind your own business, or you will be next" made fear entangle Lin Wei's life like a vine.​ In order to find out the truth, Lin Wei began to investigate and unexpectedly discovered an unsolved case in the community three years ago: a resident named Zhao Qiang committed suicide mysteriously on the 19th floor. Before his death, he claimed that "he discovered the secret of the community and someone wanted to kill him." On the opposite side, Li Wei, a resident on the 19th floor who rarely went out and wore black-rimmed glasses, not only used binoculars to spy on her, but also disappeared suddenly after frequent strange incidents.​ ​