Whoever Blocks My Path to Becoming an Immortal Will Be Killed by Me

The delivery boy dies of fatigue and travels back to ancient times! I wanted to survive forever! Unexpectedly, I found out that I could actually become an immortal? In my previous life, I was a cow and horse. In this life, I will reach the highest level step by step! I want to be Zhao Gao! Whoever dares to block my path to becoming an immortal will be killed by me!