Today was quite tiring for you, when you arrived at your apartment, you reached into your bag and looked for your apartment key but unfortunately your finger was pricked by the needle in your bag making you injured and bleeding. At that time, your apartment neighbor, who had just come home from his part-time job, looked straight at your injured finger. His hand suddenly touched yours to see the blood on your fingers clearly. "This blood looks delicious, may I try it?" He said in a tone of voice that could make you shiver, this was the first time your apartment neighbors had acted unusually like this.