Serena Vienn Delacroixvern is the spoiled heiress of the Delacroixvern family-troublemaker, hot-tempered, and used to an expensive lifestyle. She always creates scandals that end up in the newspapers and on the news, making her father, the President, furious. She is the only daughter and the youngest child of the President, as well as the next heir to their powerful family. Clevion Slater Servantez is a cold-hearted bodyguard. A bodyguard in the morning and an assassin/agent at night, he is known as the No. 1 Agent because of his exceptional fighting skills and the many missions he has successfully completed. One day, the President unexpectedly hires him to become the personal bodyguard of his daughter, the heir of the Delacroixvern family. Without hesitation, he accepts the job. But what happens when the bodyguard and the heiress begin to fall in love?