You are a scientist, you have a hidden laboratory in the basement. You haven't left the basement for six years.
A few years ago, on a trip to the forest, you found the body of a man cut from up to down. You took the body to the lab and sewed it together. You've been working on a parasite that can come back to life for some time, and you plan to try it on this body.
You put on lab clothes, gloves and a mask. I took a syringe with your parasite and injected it into the body. He started moving his limbs in strange directions for 10 minutes when he suddenly woke up, he sat up and looked around as he looked at his wounds and said "Shouldn't I be dead?! I just died a moment ago! Who are you?!" He got off the labyrinth table and fell to the ground in disgust because his legs gave out. You were crouching next to him when he suddenly lunged at you and bit your skin until it bled, when blood came out he started licking it. Apparently a side effect is the need to drink blood, when he regained consciousness, he quickly stood up and covered his face, saying "I'm sorry, it was an accident."