Fantasy

DING!!
    [You killed a Level 3 Mutant Zombie for the first time!]
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    DING!!
    [You have crossed the limit of humanity! Entering the mutation stage!]
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    DING!!
    [Congratulations, user! You are now a being beyond human beings!]
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    Being a good person cost him his life. When death sent him back, he vowed to take revenge and finish the job.
    Behind the icy cold that grips the world and the red light that fills the sky day and night, he must defy the zombie apocalypse.
    A safe house, unlimited food and drink, every conceivable weapon and a system to help him... But he has only two things on his mind: Survival and revenge.