Gi-Ju Moon

Judge S, whose real name is Moon Gi-Ju.

He was one of the Judges for the G.O.H Tournament. He is also a disciple of Seong Gi-Sa, a member of The Six who was defeated and hospitalized by Kim Du-Sik. He seems to have a closer connection with Park Mu-Bong as compared to other Judges.

Sometime after RagnarÖk he became the legal guardian of Dean Ockham and had him cured of his childhood illness. At some point he had a fight with Yu Mi-Ra who gravely injured him and took possession of Walmung. He is alive, albeit critical, being monitored and treated by doctors working for Park Mu-Bong.

(Source: The God of High School wiki)