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"Dante has lived his life hiding a secret—he is immortal. Working as a repairman, he one day witnesses a murder at the home of his client, Demis. Instead of running, he makes an unusual request: Kill me. Demis refuses at first, but upon discovering Dante’s immortality, he becomes intrigued. A dangerous promise is made—one that ties them together in a fate neither of them could have foreseen."

After beating "The Return of the D-Rank Hunter," the game, Seonwoo wakes up as the game's NPC, kidnapped by the insomnia-ridden protagonist Jaehwi, who demands Seonwoo become his Mentalist via a one-sided contract. To return to reality, Seonwoo must unlock the game’s secret ending. Will he make it?