

By Dramabeans
The King Is in Love, The King Loves
Kim Sang-hyeop
Song Ji-na, citation needed, Park Chan-kyung, No Sun-jae
40
35 minutes
MBC
South Korea
Korean
Source: Wikipedia
Song In
Child Wang Won
Wang Jeon, Marquess Seoheung; Wang Rin's elder brother
Wang-Dan, Wang Rin's younger sister who has a crush on Wang Won
Crown Prince Wang Won Nam Da-reum as young Wang Won Moon Woo-jin as child Wang Won Song Min-jae as child Wang Won

Jang Ui, Wang Won's bodyguard
Shi Moo-bi / Ok Boo-yong, a doctor who is also Song In's girlfriend who spies the king after seducing him.
Jin-kwan, Wang Won's bodyguard
Song Bang-young, Song In's cousin.
Young Wang Won
Eun Young-baek, Eun San's father
Bi-Yeon, Eun San's personal maid Song Soo-hyun as young Bi-yeon
Eun San, Princess Hyeonae / So-hwa Lee Seo-yeon as young Eun-san
Wang Young, Marquess Seowon; Wang Rin's father
Young Princess Wonseong
Young Wang Rin, Marquess Sujeong
Court Lady Jo, Princess Wonseong's court lady
Lee Seung-hyu, Eun San's teacher
King Chungnyeol, 25th king of Goryeo, Wang Won's father
Wang Rin Yoon Chan-young as young Wang Rin, Marquess Sujeong
Princess Wonseong (Qutlugh Kelmysh Beki), Kublai Khan's daughter; Chungnyeol's wife & Wang Won's mother Kim Bo-ra as young Princess Wonseong