A woman of Goryeo. She is the owner of the body into which the soul of South Korea's Go Ha-jin fell. As the second cousin of Lady Hae, the wife of the 8th Prince Wang Wook, she came to Songak to be a companion to her ailing cousin.

Her speech, behavior, modern way of thinking, and unique kindness differ significantly from other Goryeo women. Due to her changed atmosphere, she catches the attention of the princes and becomes involved with them through various incidents.

Born as the fourth son of Taejo Wang Geon, he grew up to become Gwangjong, the 4th Emperor of Goryeo. And, he was a man who simply wanted to be Hae Soo's lover.

His mother, Queen Yoo, left an indelible scar on her young son's cheek to monopolize her husband's love, and then sent him away for adoption to distance herself from her mistake. In Goryeo, where beautiful looks are valued above all, he must live his life behind a mask.

The first son born late to Taejo Wang Geon, he has a kind appearance and heart like a bear, but is invincible in martial arts.

He is a 'good person,' but lacks what it takes to be a 'good emperor.' This man is the 2nd Emperor of Goryeo, Hyejong.

Appearance, family, talent... he lacks nothing to be the next emperor, yet he feels unpleasant every time he sees his half-brother Mu, as if Mu is occupying his rightful place. He is the 3rd Emperor of Goryeo, Jeongjong.

A man of talent in both literary and military arts, he is the Goryeo version of a 'sexy-brained man.' Born in the same year as the 4th Prince Wang So, he grew up with a completely different fate and personality. A natural leader and politician skilled at gathering people regardless of status.

While maintaining his relationship with Lady Hae through an arranged marriage, he experiences the emotion of 'love' for the first time through Hae Soo. To win her, he finds himself in a situation where he must win the fierce struggle for the throne.

The grandson of the founding contributor Yoo Geum-pil. He believes he has the qualities to be emperor, but reality says otherwise.

The grandson of the founding contributor Wang Gyu. He is naturally playful and has no interest in either studies or martial arts.

His mother was of Silla royalty. He is skilled in calligraphy, painting, instruments, and pottery... there is nothing he can't do, but he is especially good at the geomungo. His brothers call him 'Baek-ah' to distinguish him from the 8th Prince. As the most handsome man in Goryeo, rumors say that when Prince Baek-ah leaves the palace, all the women of Songak run out in their stocking feet.

Since his maternal family is a fallen royal house, it was difficult for him to inherit the throne from the start. He enjoys a leisurely life but is not ignorant of the country's affairs. He truly loves Woo-hee, whom he met while hiding his status, but an insurmountable pain of the era lies between them...

Born to the same mother as Wang Yo and Wang So, he is the quintessential youngest son who grew up receiving only love, unlike his brothers.

He is a man of black-hole charm who is hated by no one and always monopolizes love. However, he is dying of frustration because his charm strangely doesn't work on Hae Soo. When Ha-jin first came to Goryeo, he was a boy full of bravado... but after returning from the battlefield, he becomes a heart-fluttering 'man' straight out of a romance comic. He harbors suspicions about the 4th Prince's usurpation of the throne and opposes him until the end.

The daughter of Taejo and Queen Hwangbo, and Taejo's most beloved daughter.

She is the full sister of the 8th Prince Wang Wook and the half-sister of the 4th Prince Wang So. She possesses dignity and beauty befitting her status, but her obsession with status and position is equally great. She inwardly regrets being born a woman and thus being distanced from the succession. Therefore, she wants to be a 'kingmaker.' She utterly dislikes Hae Soo, who spends her time singing of love in the unpredictable palace. For Yeon-hwa, love and marriage were matters of life and death, not emotions.