Shock! the Whole Class Traveled Together. I Have a Book of Mountains and Seas

My name is Zhang Cheng. I suddenly traveled through time while I was in class. I thought I was the only one who traveled through time, but I didn't expect that the whole class actually traveled through time together. Just when I thought only our Class 8 (6) had traveled through time, I didn't expect that there was a Class 8 (6) from every country who had traveled through time. Not only did he travel through time, he also traveled to a super world of immortal cultivation, the Shenxuan Continent.