Midnight Gravekeeper

I'm a senior in high school. As I was about to take the college entrance examination, I suddenly had a high fever, missed the exam, and suffered from sequelae. I couldn't exert any strength and couldn't do heavy work. I rested at home for more than half a year and found a job as a gatekeeper at a cemetery. The tombkeeper, Lao Zhang, saw that my body was weak and my yang energy was weak, so he found me a backer. The backer Lao Zhang found for me was the owner of the big tomb in the south...