Guido-Hyun is Kanglim's adopted older brother. He's strict with Kanglim but protects him from ghosts. Guido--Hyun is sixteen years old, and Kanglim is thirteen. Guido-Hyun knows a lot about ghosts and how to defeat them. He's an experienced exorcist. Although he appears unfeeling, he is caring inside, though he doesn't show it. He's mysterious and withholds personal information to almost everyone. He knows and protects Hari for reasons of his own.