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Core settings: - Protagonist: Zero, the top killer of the "Mortal Bones" organization, has the ability to predict and can see the moment of the target's death, but cannot change it. There is a second personality "Jhin" hidden in his body, which will be intensified when emotions or information are exchanged with the target, and he will complete the killing in an extreme, indiscriminate and efficient way. Afterwards, Zero has only vague and fragmentary memories of "Jhin"'s behavior. ? - Organization: Mortal Bones, a secret killer organization, believes that "everything has its way back, and Mortal Bones will eventually turn into dust". Its mission is mostly to "clean up" those who are considered to have "deviated from the track", and Zero is their sharpest knife. ? - Female protagonist: Su Wan, whose identity is unknown, is Zero's ultimate target. Her existence seems to be related to Zero's past or the origin of his prophetic ability. Meeting her will completely tear apart Zero's personality and cognition.