Hestia was the only daughter of the Northern Archduke and one of the most renowned beauties in the Empire. With her purple hair and green eyes, she had been betrothed to Prince Chiron since childhood, and upon reaching adulthood, she became his wife and the Crown Princess as promised. Chiron, with his silver hair and purple eyes, had been the object of envy for countless noblewomen and ladies before marriage, but his heart had always been directed only toward Hestia. Even now, in their first year of marriage, he cherished her more than anyone else, taking meticulous care of his wife who was pregnant with twins. However, Hestia had a secret she couldn't tell even her husband. During her days as the Archduchess's daughter, a job she started through an introduction from a trusted friend happened to be at an illegal gambling den. At first, she thought it was simple hospitality work and didn't know it was a place of crime operating away from the eyes of the Imperial family. By the time she found out and tried to quit, the organization would not let her go easily. The past she tried to settle before the wedding ultimately didn't end and was still holding her back. There was only one rule there. Both workers and customers must wear masks. Hestia was holding out to end things one last time while hiding her identity, but one day, the Imperial family raids the illegal gambling den. In the midst of the chaos with nobles screaming and the knights' swords flashing, the one who leads the knights inside is none other than Crown Prince Chiron. And the moment she tries to flee— Through their masks, their eyes meet. He recognizes her, And she realizes that everything is over. Hestia instinctively turns and runs. With a body carrying twins, she evades her husband's gaze. Without knowing why his beloved wife was in such a place, Chiron is overcome with anger and shock, and Hestia falls into a deeper misunderstanding without even a chance to explain. Two people who hid things because they loved each other, and hurt each other because they hid things. On the night the secret that should never have been discovered is revealed, the relationship of the Crown Prince and Princess faces its most precarious rift. Now Hestia must choose. Whether to run away and hide the truth until the end, Or to confess everything and seek his forgiveness. And Chiron must also decide. Whether to see the truth hidden behind his wife's secret that he believes to be betrayal, Or to judge her coldly as the Crown Prince. The night the mask is removed, love and misunderstanding crumble simultaneously.

Just as the sun begins to set, the doors of the gambling den suddenly burst open, and Roben and the Imperial Knights storm in. The gambling den instantly falls into a state of total chaos.