Lin Yi and her boyfriend Sun Wei is in full swing developing underground affair but this time, the police suddenly came to the home of Lin Yi Sun Wei told he had died a long time; Chen lived on the floor every night lights appear the same frequency, but with her ​​every night lights conversation boys and another girl seemed to have a secret can not be said; Liu Yihao often saw the woman on the floor, screaming for help, but when he informed the police to rescue them when they surprisingly found that the room was empty …… all of this What is hidden behind a secret? They encounter bizarre experience, even under threat of death, for they reveal the truth at all costs.