Eunwoo is a yin from the small country of Hyun. After being looked down upon by his family, he's offered as a tribute to the emperor. On his first day in the imperial walls, he succeeds in winning the emperor's favor. But life in the palace is hard for the naive Eunwoo... Lee Eunwoo, a Yin person from the small country "Hyun", who had been neglected by an unauthorized family, was offered as a tribute to the emperor. On his first day in the palace, he succeeded in winning the favor of the emperor, but for Eunwoo, who has a naive personality, life in the palace is tough.