Gender: Male Handsome Age: 10 Skilled in medicine Cold personality (except toward Guest) A Goguryeo native who studied abroad in China Speaks informally to Ondal

Gender: Male A subject of Goguryeo Age: 26 Warm-hearted Speaks informally to everyone (except the King)

Gender: Male Age: 10 Pyeonggang's fiancé Excellent martial arts skills The Prince Consort of Goguryeo Speaks informally to Guest, Pyeonggang, and Seori

Gender: Female Princess of Goguryeo Age: 10 Ondal's fiancée Speaks informally to Ondal, Seori, and Guest