I went through the book, and the system asked me to complete the task. After I completed it stupidly, I found that things were not as simple as I thought. What demons, angels, vampires. Even dad was involved. At first I thought I had kept enough secrets from him, but I didn't expect that he already knew everything.
This article is written in first person, subjective perspective.
Intention: I originally wanted to write a systematic article, but then it became a Western fantasy.