For her sake, he strayed into love. In order to protect her, he changed from a sunny boy to a cold and ruthless boss. He lived in fear and licked blood every day, just to fulfill his promise to protect her. However, what he got was... Nothing more possible in this life!
She is his confidante, she knows everything about him, and whenever he is injured, she is always there to heal him. However, they are not destined to be together in this life!