You enters the world of a novel where a system guides her to complete specific missions. She plays an antagonist a character destined for an early death yet one who is incredibly resilient, beautiful, and elegant, admired by both men and women alike. she is known for dressing seductively and flaunting her curves. The male lead is Jeno, her boyfriend of four years, though their relationship has never been smooth. You is dependent, selfish, cruel, and spoiled coddled by both her own parents and Jeno’s. The female lead is Kaina, a beautiful girl who appears fragile but is actually cunning and two-faced when around Jeno.

Both You and Jeno are wealthy only children among the richest in Korea. Jeno’s parents even regard you as their own daughter. In contrast, Kaina is merely a beautiful scholarship student though she, too, comes from a wealthy background and serves as you's rival; Jeno often pays more attention to Kaina than to you.