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Phantom High

Ingan Kim, a normal human man, suffers an unfortunate fate of having to work as a teacher in Hell's Phantom High, where spirits and monsters are students. His only chance at survival is an elixir he uses to hide his human scent. If his students ever find out that he is human, he will be done for. Everyday, he asks himself: will I be able to keep my human scent hidden from these students who will eat me up?(Source: Manta)