My girlfriend is an assassin

“The gracious Anna turns cold after her whole family is wiped out in a day. She vows to bulge out the eyes of the muderers of her family and won't stop until they are all dead. She gets adopted by an assassin and is trained to be one. Popularly known as the bloody queen, Anna is shattered when she finds out that the father of the man she loves, is one of the muderers she seeks after. What will she do? Kill her father-in- law to be or break her promise to her family?”