Because of her work, Zhen Xi was forced to live in the home of her distant relative, Grandma Xu. Grandma Xu was withdrawn and rarely interacted with others. The tenants who live in the same building as Grandma Xu are a poor couple raising a mentally retarded boy, Sister Xu who lives alone during the day and night, a couple who drifts to the north, and an old widower (shoe repairman) who was widowed early in life. Grandma Xu raised a black cat named Tuanzi. One day, the black cat in Grandma Xu's house died suddenly and tragically. The vacant room on the sixth floor, one after another missing cases, the sudden appearance of her mother, Zhen Xi and her colleague Gu Yan who didn't know the truth were involved in each of the bizarre cases...
Concept: Suspense in the early stage and bloody in the later stage, reality is imaginary, imagination