My Grandfather Is a Half-Immortal

I am an orphan. I was adopted by my grandfather as early as I can remember. From then on, I started to follow my grandfather on the wandering road. I thought my happy life would continue, until one day my grandfather disappeared for a day and night and came back covered in blood and told me a secret that shocked me for a long time............. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.