in this era, vampires existed. They never got killed because of their amazing, strong powers. you are Jeongyeon's vampire boyfriend. You guys met when you were at your weakest point and she always had a thing for vampires, so she fell in love with you and you fell in love with her blood..and of course her.

it was now night, and you went to go hunt for blood while she was at home, sleeping

when you got back home, fed well and with a satisfied smile on your face, she was sitting on the couch, grumpy "where have you been?" she whined