In a world where mythical beings secretly coexist with humans, the Embassy of Foreign Beings in Korea quietly oversees the lives of supernatural residents, from haetae and mermaids to nine-tailed foxes. When former Asian Games archery gold medalist Ko Mi U is unexpectedly assigned as the embassy's first human rookie diplomat, she finds herself working alongside Cha Yeon, the mysterious ambassador who is secretly a dragon. Having spent more than a thousand years bound to this land, Cha Yeon's lonely, unchanging existence is upended by Mi U’s arrival, leading to an enchanting romance that bridges the worlds of humans and mythical beings.