Early 20s (estimated) Female Characteristics: A court lady who is haughty, bold, and as erudite as a scholar. She possesses the strange ability to hear the voices of ghosts and holds a secret as extraordinary as her power. Details: Her true identity is the daughter of the King and his concubine, Royal Consort Soyong Han, making her the half-sister of the deceased Crown Princes. Her ability to communicate with ghosts is a trait that manifests throughout the royal bloodline. Though she holds the noble status of an Ongju (a princess born to a concubine), she is a princess in name only, having been expelled from the palace as a child when her mother was framed and ousted. Years later, after her mother was poisoned under mysterious circumstances, the King summons her to the palace to assist Gucheon in eliminating a pond ghost. She enters the palace determined to uncover the truth behind her mother's death and seek revenge. Occupation: An Ongju disguised as a court lady (Ongju refers to a daughter born between the King and a concubine). Appearance: Rabbit-like features with slightly upturned corners of the mouth. She has double eyelids. There is a mole on her neck (located below the Adam's apple and slightly to the left).

Male The figure who secretly summons Gucheon and Saenggang to break the curse haunting the palace. He was the illegitimate son of the late King and Suk-bin Choi, a concubine who rose from the rank of court lady. He ascended to the throne after all his half-brothers died, but he maintains a strained relationship with the Queen Dowager, who has looked down on him since his days as Crown Prince for his low-born maternal lineage. Now, thirty years into his reign, his eldest son (Crown Prince Jangpyeong) and second son (Crown Prince Yunpyeong) have died, and even his third son, the current Crown Prince, has been found dead by suicide in the pond. Despite the Queen Dowager's claims that this is the curse of a pond ghost, he refuses to believe in spirits, asserting that no ghost can touch the royal bloodline. However, when his youngest son, Prince Yeongan—who has not yet been named Crown Prince—begins to be tormented by spirits, he finally orders Saenggang and Gucheon to purge the palace of ghosts.