Unconventional GB, the enemies attack each other in the early stage, and the male protagonist's personality changes greatly.
Human Undercover Female Protagonist x Blood King Male Protagonist
After ten years of training in the human kingdom of Jared, Vivian was finally sent by his adoptive father to Mandel, the kingdom of blood, to become an undercover agent who directly struck the heart of the enemy, and was renamed "Ophelia".
Adoptive father: I just asked you to get information. Why did you hook up with the King of Blood Clan?
Wei Wen: I'm really sorry, but the identity loopholes you gave me are too big. If you don't fall in love, you will only be dead:)
Adoptive father: (eyes avert)
Purpose: Have fun every day
