I'm Half a Demon

I am a half-demon, with a human mother and a demon father. When I was three years old, my father was killed by another powerful demon, and my mother fled with her to my grandmother's house in the countryside in the south. As long as I can remember, my mother asked me to go home before 18:00 every night and then close the door. By the way, my home has no windows. I lived like this for thirteen years, until one night, the teacher rehearsed the New Year's Day program, and I was forced to stay. On the way home, I raised my head and glanced at the moon, and everything became different...