Whether it is day or night, there are different types of men, in the Sham Shui Po an old tenement buildings in and out. Obviously this is not an ordinary tenement, enough to make men's inner universe! Tang floor corridor layout of psychedelic, in front of each unit are arranged too colorful, even more is that every door stood a dress extremely sexy woman, the immediate scene foot so many men at a glance, it is Hong Kong's famous red light district, a floor a chicken! Li Jie (Carrie Ng) is the manager of the building, to the building of the prostitutes who charge rent. She and the tenants are all very good feelings, only beautiful sister lead. But the building is about to face the fate removed, was in the political arena of Li the elder sister is not easily into submission, even in the face of the underworld threat Li the elder sister also calm. However, they do not know is that death is quietly approaching to them... Everything from the beginning of the disappearance of prostitutes A Ping. A Ping is a beautiful sister one tenant, fathered a daughter small child. Aping the missing news disrupted Li the elder sister and all of the winter solstice dinner, they first thought is the underworld for eviction and unscrupulous, originally wanted to privately resolved, but they in search process has gradually found incident confusing, Li the elder sister now just know, there have been many prostitutes are missing in the building, but unexpectedly unmanned discovered! Beautiful sister dare not take it lightly, while she progressively closer to the truth, companions but actually have been killed. The building is also for no reason and external isolation. A bloody massacre began! Overnight, they should find out the beautiful sister A Ping, and also to see the battle of wits. All the more suspicious, even the murderer hidden in them, make them step by step. As the murderer almost certain occasion, a hidden 20 years also gradually lifted the tragic truth...