The protagonist Wu Yirou and her family all live in a rented brick house and have a very hard life. Yirou had an unhappy childhood when she was young, but she never gave up her fantasy of life. She is a girl with a dream. However, no one is allowed to go up to the fourth floor or above of this shabby house, but Yirou can always hear strange sounds at midnight. By some mistake, she accidentally broke into that forbidden area, and a series of horrifying things happened that gave her nightmares every night. It was also in this house full of love that she actually met the boy she had had a crush on for four years in college. This boy brought her surprise and longing, but it was also he who started her nightmare. Finally, she fell into the quagmire and lost herself.