Areum falls into a strange world called 'Soltera' after a car accident. Mistaken for a vampire because of her hair color, she is sold by a slave trader to Duke Millard Travis, the one and only vampire in Soltera. Desperate to survive in any way, Areum becomes Millard's personal servant, vowing to serve him as her master. Day by day, Areum tries her best to serve Millard, and his attitude starts to change.