That adventure made Ding Hao confident.

With the help of the Mind Essential, Ding Hao hardly slept in the rest of his stay. In addition to eating, all he did was to cultivate. Practicing martial arts, inscriptions, Pill skills, craftsmanship, sword intent, and saber intent. He cultivated day and night. He had been in a state of madness.

...

There were no sun and moon in the underground, and time flew by quickly.

In the blink of an eye, ...