Through Tian Shu's explanation, Feng Qi had a detailed understanding of the reason why he chose to seal himself in the underground prison.
Back then, when Tian Shu lost control and pursued the domain creatures, inadvertently returning to the human world, he could not return to the Path to Heaven like Mu Yao.
At this moment, he was undoubtedly a time bomb.
He could lose control at any moment. When that happened, he had no command over his actions whatsoever.
More importantly, the time it took to lose control was completely unknown.
It might only be for a few hours, or even a few days. It might not be safe anywhere.
He might even kill his way into a human city.
This would be a terrifying disaster for the major cities that had just established their cultivation systems.
Faced with such a situation, Tian Shu, who could not find Mu Yao, could only choose to seal himself.