Adrian, trillion-dollar CEO of Sterling Group, enters a marriage of convenience with Elowen, a noble-born heiress. After the wedding, he gains a strange ability: he can hear every inner thought of his new wife. Outwardly, she is a gentle socialite. But she is actually Elara, Elowen's twin sister. When her elder sister was injured, Elara was brought back from a welfare institute to take her place. To her, this marriage is just a deal—she wants to collect the money and run. Amused by her wild inner monologues, Adrian glimpses her true self: a spirited, loyal girl haunted by inferiority. He falls for her. Though he has seen through the fake marriage, he protects her in secret—buying the fireworks studio she longed for and helping her chase her dream. While Elowen keeps acting the perfect heiress, she grows entangled in the lies. Before she knows it, genuine love blooms. Yet she fears everything will crumble once her true identity is revealed. As rivals stir trouble and the twin-sister truth draws near, this marriage built on secrets faces a severe test. When the lie comes out, their cross-class romance must stand against family schemes and past traumas—a spicy, funny sweet-romance billionaire drama.