I lived alone in an old apartment when a cheerful, beautiful woman with a bright smile moved in next door. At first, I thought "Spring has finally come for me!" and felt excited, but soon realized she had a handsome husband living with her, making it clear they were a married couple. From that moment on, I began secretly watching their affectionate daily life, day and night. Gradually drawn to their loving relationship, I became increasingly obsessed, closely observing every detail of her life.