I Cultivated Immortality and Returned to Earth, and You're Only at Advanced Martial Arts?

“Master, just how powerful are you?” “The truck that hit you back then? I was the one driving it. I have to say, cars in your world are pretty fun to drive.” Lin Chenxing: ??? “Today, I’m sending you back to your world to pursue your own path.” “Master! Does that mean I’ll transmigrate back and become a rich second-generation heir, with a trillion in assets, marrying a beautiful heiress and reaching the pinnacle of life?” “What are you dreaming about? I’m sending you back to train, so naturally I won’t give you such an easy start. Remember to practice your punches every day.” Lin Chenxing: … After returning to Blue Star, Lin Chenxing discovered that he still had all his cultivation. Just as he thought he could do whatever he pleased in this ordinary world, he found that Blue Star was now overrun with strange beasts and had long since changed beyond recognition. “The talisman reminds you to practice ten thousand punches today. Failure to complete the task will result in punishment from your master.” Lin Chenxing: “Master! Please give me a break!”