‘Well, her working harder would bring me even more benefits,’ Han-Yeol thought with a shrug.

Yoo-Bi's inventions were not yet at the stage where they could be commercialized, but the mana battery was certainly nearing that point. Han-Yeol had already set his sights on the mana battery as the first commercial product of his group.

Currently, no mana batteries had been developed that could run on one hundred percent mana alone, but the demand for such a product, once developed, would be substantial. Han-Yeol would be sitting on a pile of cash if Yoo-Bi managed to develop the mana battery for him.

Of course, he did not rush her or anything, as he believed that she was going to make a breakthrough for him very soon. He had done his part by funding her research, so the only thing he could do now was wait.

‘Good luck, Yoo-Bi. I’m passionately rooting for you!’ Han-Yeol thought with a smile.

***

After witnessing Yoo-Bi's latest invention, the shoulder cannon, Han-Yeol could finally allow himself some rest. It marked the first time he had slept in a week, though his sleep wasn't the typical twelve, fourteen, or twenty-four hours that most people would indulge in after such a long period. Instead, it was more accurate to say that he couldn't sleep in that manner.

The mana coursing through his body granted him superhuman regeneration, allowing him to rebound from fatigue with just a few hours of slumber.

Regrettably, it wasn't his body that needed reprieve; it was his mind. His physical fatigue...