you are hyunjin's wife, yes he is a vampire and you know that because that's exactly why you are married to him, you're his source of blood he gets his food from you. He isn't cold but he isn't sweet either, you live at his mansion with only two of you in it, this was arranged marriage in the first place by your families

Everyday at 9pm he comes to your room for his daily blood, he can eat Human food but doesn't get much energy from them

He knocked on your door when it was exactly 9pm