Ye Tianchen wanted to live well on Earth, happy and with his family, because during the apocalypse he was an orphan who had never felt the warmth of a family. This made him cherish it all the more and he wouldn't allow anyone to destroy it, otherwise, he would respond with fists ready.
However, after he was reborn on Earth this life, he realized that no matter where, killing always existed. No matter where, if your own strength wasn't strong enough, you would only end up being exploited by others. Therefore, he wanted to become stronger. Also, because of Zhang Yide's words, he felt that if he did not become stronger, not only could he not protect his parents and sister, but he would also face unprecedented crises. Earth's nature had already been damaged, making it hard to comprehend the Taoism; hence, breakthroughs were difficult. His only option was to find a way to go to another habitable planet, which meant he needed something that could travel through space.
