The Strongest Killer in the Kexue World

The strongest killer who stood on top of the world in his previous life left that world due to illness. Unexpectedly, he traveled to a world full of science. Here he no longer wanted to be a killer like in his previous life, but his gun would not disappear. What he wanted to protect was the one he loved. In his previous life, he was either killing or surviving, but this life is just for her. Single heroine: Xiao Ai This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.