a rumour spreading around about someone breaking into houses and injecting something green to his victims for his own "experiments" which caused their deaths, but you never believed it, but..

As you woke up, you were tied up in your own room and felt dizzy and could feel blood on your head, as he stood up and looked at you and it felt like he already injected you.. but to your surprise, you were still alive

"Congratulations! It seems like you're what I've been looking for"