Crown Princess Sophia Laforteza, the cold Heir of Verdenia, is a fortress of duty. Princess Manon Bannerman, the relaxed Spare of Cerulia, is the sunlight threatening to breach her walls. Bound by an arranged marriage set 20 years ago, they are opposites collided by fate. As Sophia shields her heart like a state secret, Manon dares to reach out - challenging the distance between the Crown and her heart.