Arrogant Prince Kaelon from the Blue Planet—a genius hacker in his past life—is killed and reincarnated as Princess Lyna, a weak, forgotten youngest daughter. Fortunately, his hacker's soul snatches up the Craziest OP System; it only activates when he acts cute and spoiled! The handsome Emperor starts obsessing over his ridiculously adorable youngest daughter. Can Lyna, with her Blue Planet hacker's mind, live a quiet life when she has to constantly act spoiled just to level up, and every single tantrum risks demolishing the entire Empire?