Sang In-Hyo

Sang In-Hyo is presented as the leader of the Cave of Latent Demons early in the story. He is shown when one instructor of the cave shows concern about the number of dead recorded till date in the cave.

Though he doesn't give much attention to the dead claiming its a norm for the cave(following the dead by three NOTs), he shows interest to the top trainees in the cave and specifically number 900(Hyuk Woon Sung) who suddenly develop a talent for martial art.

He later seem to give more attention to the top training claiming the aim of the current group was to produce demonic captain and maybe demonic generals. As a result he seem generous with resources to the gifted and punishment to those lacking. but in return for being generous, those benefiting were to undergo more intense training.

he is later discover to be a member of the notorious unrecorded group and follows to support Hyuk Woon Sung in conflict for cult of heavenly demon leading position.