“Today, I marry someone who does not love me.” Princess Lilia of the Kingdom of Elre has long harbored secret feelings for Prince Oscar of Glanz. But it was her elder sister, the stunning and regal Isabella, who was chosen as his bride. Resigned to her quiet heartbreak, Lilia prepares to step aside—until, just before the wedding, Isabella withdraws from the engagement. Lilia is asked to take her place. Carrying both hope and fear in her heart, she becomes Prince Oscar’s wife. But his gaze remains fixed on Isabella’s shadow. Wounded by his coldness yet determined to fulfill her role, Lilia gives everything she can as Crown Princess. Can their relationship shift from obligation to real love—or will she forever remain second in his heart?