Marry the Enemy, Hunt the Monster

Kim Seol-ri is studying abroad when her parents die one after another in a run of incidents that are not accidents. The name that keeps coming up is Dracula, and nobody knows who that is. Her father's will leaves instructions that she marry Shen Houming, the childhood friend she grew up next to, a man who shows nothing on his face. She agrees to it. The marriage is how she announces that she intends to find the person responsible and put him in front of a court, and the wedding is where she says so. She digs, and the deeper she goes the less the arrangement looks like a contract to her.