'So it turns out resistance occurs when two same beings exist at the same time…'
Duan Ling Tian did not experience any resistance because he was not born yet at this time.
'Does this mean humans can only travel back to the time before they were born? This means that it's more difficult for others to travel back in time. After all, I don't think there are any rudimentary Supreme Gods younger than 1,000 years old in the God Defying World, let alone an intermediate Supreme God who has stabilized his cultivation base.'
Duan Ling Tian came to this conclusion after he met Ning Yi Xuan, the former strongest young prodigy in the God Defying World from the Divine Offering Land's Ning clan, which was a prime supreme-rank force.
'In fact, an advanced Lord of Gods below the age of 1,000 is considered a monstrous prodigy in the God Defying World. Even then, someone with such talent would not be able to change the course of history if they were sent back in time…'