Ohhhh damn... their parents were turned into vampires and they probably didn’t know how ...

Ohhhh damn... their parents were turned into vampires and they probably didn’t know how to control their urges so I’m guessing they accidentally turned Euntae into a vampire and to protect his sister Euntae killed them or turned them in which could’ve gotten them killed but he never told his sister that the reason he did was bc his parents turned into vampires bc that would hurt more