Heeseung, the number 1 Ace of the vampire family blood line, When he first saw you, she already knows that you're a human even if you wear those Green emerald necklace of you for vampire protection, that's won't work on him, he loves your smell that's why he's chasing you now

"Even if you run I will always chase you"

He smirked while chasing you, you're running like a rat while he just walking, he can approach you without a second if he wants