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17 is a killer, a killer who will retire at the age of 25, but... Before he can spend his pension, he inexplicably traveled through time... Nuclear weapons, implantable armed prosthetics, nuclear exoskeleton armor, mechanically modified humans, biochemically modified humans, nuclear-powered armor... This world makes the always calm 17 a little confused, but even if this world is full of crises, he still will not give up the hope of finding a way back to Earth... Until he becomes a war mercenary, the truth of the world will be revealed one by one...

April Fool's Day 2020, Cheng Song's birthday, the day of unemployment... But why did everyone change after this day! ! The whole world is "reborn"! Only I don't! Will I be caught and sliced ​​into slices? ! Due to some unknown reason, thousands of multiverses that were originally on the same orbit suddenly began to merge. In each multiverse, people were reborn into this universe. Our protagonist Cheng Song, after realizing that he might be the only native of this universe, has lived a sneaky life ever since. However, the appearance of a roommate completely shattered his plan to survive... He... Started to get wild...