Overlord of the Immortal Realm: National Crossing

Here, in the ancient continent, there is no prosperous technology and civilization, only. . . . Ahem, I can't make it up anymore. Zhang Yingtian was sleeping in class at the university, but when he woke up, he was transported back in time to a genius from a family of cultivators from another world. Originally, he thought he would be the only one to travel to the top of the world. But who would have thought that he would find another time traveler, followed by a second and a third. . . . Only then did he realize that the world would definitely not be that simple.