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The novel takes place in the present day, when Shin Siwoo, a brilliant mathematician and the protagonist, is abducted and taken to the secret city of witches known as Gehenna after a plane disaster.
Due to the fact that magic and math share some parallels, he was able to learn magic while he was a slave for five years and eventually became the only male witch in the entire globe.
His objective is to leave the city and return to his native country while keeping his magical abilities a secret.