As night fell, the city lights twinkled like stars in the darkness. The bustling traffic gradually subsided, leaving only a few pedestrians hurrying by. An old apartment building in the city center appeared particularly desolate. Only dim lights illuminated the stairwell, the peeling paint on the walls and the creaking wooden stairs groaning. On this peaceful night, a disappearance occurred, changing the fate of many. I. The Missing Girl, Li Yao, was a twenty-year-old university student living on the fifth floor of this old apartment building. She was a quiet and introverted girl, usually getting along well with her neighbors...