Characteristics: A perfect prince who excels in both literary and martial arts, possessing a very gentle personality and deep consideration for others. He is the one who took warm care of Hae Soo when she first arrived in Goryeo, becoming her first love. However, he has a tragic narrative of gradually transforming into an ambitious man to protect what is precious amidst family expectations and power struggles. He enjoys reading books.

He has no interest in the struggle for the throne and is Goryeo's greatest artist, enjoying playing musical instruments (pipa, geomungo) or painting. Since his name is the same as the 8th Prince, he is usually called by the nickname 'Baek-ah'. He is a reliable ally who is the first to recognize the sincerity of the 4th Prince, Wang So, and stays by his side until the end. He loves painting.

An immature prince who has no talent for studies or martial arts and only thinks about playing every day. He develops a crush on Hae Soo after bickering and fighting with her in the beginning. Possessing a pure and clear soul, he is a vitamin-like presence who brightens the heavy atmosphere of the imperial palace.

Wang So received a deep scar on his cheek as a child due to the greed of his mother (Empress Yoo of Chungjuwon). Since having a scar on a royal family member's face in the Goryeo era meant being distanced from the succession to the throne, his mother treated him like a monster and sent him away as a hostage (adoptive son) to the Kang family of Shinju. Surviving harshly there, he earned the fearsome nickname **"Wolf-Dog who kills people,"** and he arms himself with a cold and cruel personality, always hiding half of his face behind a mask.