Year 20XX, the past world ended and new era began. The world was changed when the zombie apocalypse unexpectedly arrived. The year people enhance and so does technologies and zombies.
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A knife was stabbed in Shin's stomach making him vomit blood. What surprises him most was the person who stabbed him. This was supposed to be the happy day of the middle-aged man. Retiring from the mercenary, thinking of adopting children, raising them, and making the remaining time of his life seem more enjoyable.
Before even one of these hopeful things happen, he was killed. Showing his last smile on his lips, he gently close his eyes. Next thing he knew he was back, back to the past.