It's been a few months since I got married and started living at my husband's parents' house. I was nervous at first, but thanks to my kind father-in-law, I feel like my home is now accustomed to living in. However, there is one strange thing. My father-in-law's room on the back of the second floor had an unusual atmosphere that seemed to say not to get close. One day, I had to go out until the evening earlier than planned and returned home, but I heard a faint moan from my father-in-law's room on the back of the second floor...