After the College Entrance Examination, I Accidentally Entered the Apocalypse and Came Back Invincible.

After the college entrance examination, Xu Xiao met a strange person. He said that as long as he stayed in another world for 100 years, he would be given 100 million when he came back! Only a minute has passed in the real world! I thought pie was coming from the sky, but unexpectedly I stepped into the apocalyptic purgatory. An ordinary high school student in the past struggled to survive in blood and fire. After a hundred years of fighting, he finally became the Black Emperor that everyone revered in the end of the world. At the expiration of a hundred years, he returned to reality in an instant, received a huge sum of money, and was accompanied by invincible combat power and a warehouse full of top-notch black technology. When the world changes and everyone is afraid, Xu Xiao pulls out the black knife. "It doesn't matter, your emperor is back!" [Slow heat in the early stage, then explosive excitement later!