Make the Dragons Great Again? Ah, Me?

In his previous life, Ryan was a dragon-slaying warrior who led the continental coalition to overthrow the rule of the dragon. Three years after his death, Ryan woke up in the body of an ancient dragon that had slept for thousands of years. Good news: Ryan is now stronger than that dragon. Bad news: Humanity has written "dragon slaying is justice" into political correctness, and the dragon clan, whether good or bad, is being liquidated in all aspects. The former fiancée Vera became the leader of the Imperial Knights. As soon as they met, she chased Ryan and chopped her, shouting "Those who blaspheme the brave will die". The remnants of the Dragon Clan followed the legend and found Ryan, begging him to lead the Dragon Clan to revive and make the Dragon Clan great again. Humans want to kill Ryan, and the dragons want Ryan to be king. He just wants to figure out one thing - only three years have passed since his death, why do humans want to drive out all the dragons? What's the problem? Investigation? Check. Being hunted? Hide. Identity exposed? Escape. The most powerful ancient dragon in history, with full-level attributes and skills, even if you want to be a dragon, you can't understand it. Ryan just wants to live a good life, why is it so difficult...