Killed by her most trusted comrade, Assassin Agent Black is reborn as the baby princess of a historical novel. Immediately, she faces repeated assassination attempts and is even forsaken by the king when he refuses to give her a name, but she won't let anyone get her this time. As she uses her assassin skills to survive, she starts making allies, saves the prince's life, and even catches the king's interest. But with a target still on her, will that be enough to keep this little princess alive?