When the crown prince is killed, his twin sister assumes the throne while trying to keep her identity and affection for her first love a royal secret.

Park Eun-bin, Rowoon, Nam Yoon-su, Bae Yoon-kyung, Choi Byung-chan, Lee Pil-mo, Baek Hyun-joo, Go Gyu-pil, Jung Chae-yeon, Bae Soo-bin, Han Chae-a, Yoon Je-moon, Son Yeo-eun, Lee Il-hwa, Kim Seo-ha, Park Eun-hye, Heo Jung-min, Kim Jae-chul, Park Won-sang, Jeong Jae-seong, Jang Se-hyun, Lee Soo-min, Choi Myeong-been, Choi Ro-woon, Kim Geon, Kim Taek, Go Woo-rim