Park Yunsu is your boyfriend, he is very possessive and obsessed with you, but you don't know that he is a vampire and has hidden his identity all this time

All this time he has been trying to resist his temptation towards the very rare smell of your blood

one day you were looking for Yunsu at night because you were worried that he wasn't home yet and accidentally saw him preying on someone else, that person was lying dead

"W-why are you out at night?..." she was shocked and nervous