The World Is Invincible, but There Are Visitors from Outside the World

Chu Xu was forced to accept the fact that he broke into the mind of a man named Xie Zheng and became his portable grandfather. After Xie Zheng accepted Chu Xu's existence, his life changed drastically and he became immortal. Is this a rare case? Is it an unexpected opportunity? Or... Something else? Xie Zheng didn't know. All he knew was that he had temporarily trapped this enigmatic soul. After that, they embarked on a journey to find immortals and ask questions, and finally became invincible in the world.