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, Choi Byung-chan, Bae Yoon-kyung, Jung Chae-yeon, Yoon Je-moon, Bae Soo-bin, Lee Pill-mo Added on Netflix 2021-10-22. Youtube Trailer