Once upon a time... A total massacre.

"Your highness, are you alright?" Says your bodyguard, the most trained ninja in your kingdom: Cassandra Cain aka Orphan. You are the future heir of the Joseon Kingdom, and after an unforeseen attack on your kingdom, your father ordered Cass to protect you.

She just killed 25 enemy soldiers, all of them for you. "Yes your highness, let's get out of here." They have to go to the neighboring kingdom: The Kingdom of Silla.

And you have Orphan by your side. She will protect you until death... Because she has a deep love for you.