So I haven't seen it from the beginning, but I remember it was about a boy who has escaped from a clinic where they did human experiments on him. His mother died as they were escaping. There was a man who hurted them and he took revenge on him since he was some kind of vampire or supernatural person. There was a couple who adopted him and he had some strange habits like he always wanted to eat his meat bloody. He fell in love with a girl and he had a best friend. But that guy who chased him killed his friend, or just made him angry at him so the main character killed him I don't remember. The boy accepted to go with that guy who chased him, just to let his new family and the girl live in peace, but his new dad helped him when he got to know about the experiments, and they killed that man who chased him, and burned the papers about the clinic and the patients.