Anyone would be worried or even afraid if they were to drive on a road that no one knew the end of or the direction of or what they would encounter in the future in the dark of the night.
This was Xu Tui's current state. He had already developed a huge fear because of his cultivation progress in genetic ancient martial arts.
Currently, a year of cultivation was equivalent to ten years of cultivation by Senior Brother Meng Sixi. A few months later, a year of cultivation was equivalent to 20 years of cultivation by Senior Brother Meng Sixi!
This cultivation efficiency was too terrifying! It was so terrifying that Xu Tui was afraid. He was afraid that there might be problems with his cultivation efficiency.
Moreover, Xu Tui could continue to increase the efficiency of his training. If he continued to improve, what Xu Tui would obtain in the future might be what an ordinary genetic ancient martial artist would obtain after 30 years of bitter cultivation.