The series "Alangsattojeon" is a South Korean adventure fantasy about a ghost who tries to find his killer. The events take place during the Joseon era. The son of a nobleman, Lee In-o, arrives in a small village in search of his missing mother. He meets a mysterious girl named Aran. It turns out that she is dead and only he can see her soul. The girl doesn't remember anything about her past, but she has a hairpin that belonged to In-o's mother. The boy decides to help her uncover the truth about her death in exchange for her assistance with his own problem.