He was selected to become an agent of Existor that serves the Erudon family in part due to his unwavering loyalty even from an early age. He was assigned to support the young master Ronan of the Erudon family. Even during the Kingdom Wars when Ronan was roaming the battlefield against his will, Harpe was always by his side. Unfortunately, Ashtaroth held Harpe's soul hostage and used it as bait to lure out the Grand Chase. As a result, Harpe met his end with many regrets in life.