Crown Prince Taehyung is a smug, indifferent and insensitive man, who is actually lonely on the inside. As the successor of the emperor, he agreed to the arranged married with Park Chaeyoung, the daughter of the prime minister. Though he was initially annoyed by her naivete, he gradually begins to open his heart to her. He felt threatened when his cousin- Prince Jungkook showed up. As his father suddenly died, He quickly becomes rivals with Prince Jungkook to get the throne, who not only fights for the throne but also for Chaeyoung's affection.
PARK CHAEYOUNG- The daughter of a noble family who is gaining power in the royal court. Smart, bright, well-mannered and well-loved. As a prime minister's daughter, she was chosen as the Crown Princess. Though she seemingly mature, she is full of doubtfulness at the same time. She is supposed to be betrothed to Crown Prince Taehyung. Though she was initially afraid of her seemingly unemotional future husband, Chaeyoung gradually falls in love with him, not knowing that he harbors similar feelings. Until finally she sees Prince Jungkook as the man who treated her better, the man who shook her heart.
Prince Jungkook, The son of the Crown Prince Jeon-Shin. After his father's sudden death when he was 6, he was exiled from the royal palace with his mother, Lady Jeon-Hwa. After the sudden death of the current Crown Prince-Prince Tae-Shin (Prince Taehnyung's father). He has an equal chance to fight for his right as the real crown prince along with Prince Taehnyung. He fell in love with Park Chaeyoung, who was initially betrothed to him. A kind-hearted and gentle person, Prince Jungkook was not interested in fighting for the throne before, but not after he met Chaeyoung.