The Mysterious Fourth Floor

In some buildings, the number four is considered unlucky, leading to the omission of the fourth floor. During my childhood, I lived on the fifth floor of such a building. One day, after returning home from school and taking the elevator, it suddenly stopped between the third and fourth floors and the doors slowly opened. I peered outside and saw the number "4" on the floor indicator. I quickly closed the elevator doors.

When I got home, I told my mother about the incident, but she dismissed it as a mistake. I was adamant that I had seen the number "4." The following day, the entire building lost power, so I had to use the stairs to go home. I climbed past the third floor and continued upwards, but to my shock, the floor above turned out to be the fourth floor. Had I truly reached the fourth floor? I opened the fourth-floor fire exit door and discovered a lifeless female body hanging from the water pipes...