History's Strongest Senior Brother

It was Yan Zhaoge’s first time transmigrated into another world. He landed in a martial warrior civilization that was at the peak of prosperity. He ended up in the Divine Palace’s library, which collected and preserved the classics of the entire world from all fields of knowledge. However, a world-class calamity struck soon after, and even the Divine Palace was destroyed.
Yan Zhaoge’s soul once again transmigrated into another world. The twist was he arrived in the same world, except countless years have passed.
With his brain full of rare books and classics from the era of peak prosperity, Yan Zhaoge’s second transmigration to the present era was like a gamer who was used to playing hell mode suddenly finding himself playing the game on easy mode.
That was just way too awesome.
But before that, he would need to fix a problem.
“I’m not the main character? In fact, I’m actually the main character’s love rival and the antagonistic Mr. Perfect senior brother? This script is wrong!”