My Neighbor Is a Retired Villain

I found out that my neighbor was seriously ill. This man sleeps day and night and never greets anyone. The flowers growing on the balcony are weird and will glow in the middle of the night. He can carry a solid wood bookcase up to the fifth floor with one hand. The most outrageous thing is that he gave me a tattered book with five big characters written on the cover: "Great Self-Contained Demonic Skills". I almost called the police. One day I was also sick and tried to practice. I'm flying.