The Ancestor of the Mahayana Period Traveled Back to the Earth

[No system + true invincibility + ease + decisive killing] Freshman Yao Feitian went on an outing during the summer vacation and accidentally fell into an ancient monk's cave. He traveled to a different world and practiced for 6,000 years. After experiencing many hardships, his cultivation reached the peak of the Mahayana period. Just when he was crossing the last thunder tribulation of the heavenly tribulation, Yao Bangtian was struck by the thunder tribulation. A golden light flashed in front of his eyes, and he miraculously appeared in the cave before crossing over. Only when he looked at the time did he realize that only a week had passed. What surprised Yao Zhaotian was that his Mahayana stage cultivation was still there! So, on the first day of the new semester, a new student with the peak cultivation level of the Mahayana period entered the school. "What? The ancestor of the Jiang family in Luoyang City, the majestic martial sect was defeated by Yao Feitian's finger?" "It's bad, Dean, that guy said he wants to fight with you!" "What? Arrange a special plane for me quickly, I'm going to hide abroad for a few days!" In a business office, a middle-aged man stood up in a hurry and said with a shocked expression. "It's too late, Dean, that kid can fly faster than a plane!" (Please encourage me for the new book, please be gentle and scold me, readers)