Princess Cheonmyeong (Actor Park Ye Jin) is the first daughter of King Jinpyeong, the older twin sister of Princess Deokman, wife of Kim YongSu, mother of Kim ChunChu and sister-in-law of Kim YongChun. Originally she sought to simply avoid Mishil, but her husband, Kim YongSu's death spurned her to want to bring down Mishil.

She defends and protects Deokman upon learning the truth, and ends up being killed after being mistaken for her sister by Daenambo.