In an alternate-reality South Korea, where a constitutional monarchical system prevails, Oh Sunny, a musical actress, becomes the empress of the country. Thus begins a dispute for power in the royal palace. Nothing is what it seems, and Oh Sunny is ready to fight until the end to uncover a mysterious homicide within the royal palace, fighting to protect those she loves the most and obtain happiness.

• Jang Na-ra
• Choi Jin-hyuk
• Shin Sung-rok
• Lee Elijah
• Shin Eun-kyung
• Oh Seung-yun
• Oh Ah-Rin
• Park Won-sook