[1][2] The period drama is based on Seodong-yo, said to be one of Korea's oldest folk songs and its first hyangga.

Seodong finds Seonhwa, marries her and takes her to Baekje, and they become the royal rulers of the country.

[3] Seodong is just a commoner, a technician who grew up in Baekje's prestigious science and technology institute Taehaksa, but his life is on the brink of extraordinary change.

He meets and falls for Princess Seonhwa of the rival kingdom Silla, and his love for her transcends social position.

Seodong also carries a secret that could alter the fate of the Baekje kingdom, but his rival Sataek Giru plots with Buyeo Seon to disrupt his plans.