Zhao Yun was stumped once again by this question.

Wasn't this common knowledge?

The sun, moon, and stars of the Cathayan Underworld were manifested by Hell's three creation-grade divine artifacts. As for how these celestial bodies were manifested, even beings above the Yama-King level were unable to find out.

No one would bother to ponder this question as there was simply no point!

Qin Ye paid no heed to what Zhao Yun was thinking as he pointed up at the sky and said, "Look, the sun and the moon of the underworld are the same as the ones in the mortal realm. You can even see some familiar constellations like the Big Dipper. However, do you know what the oldest star chart in the world is?"

Zhao Yun was completely unable to follow Qin Ye's logic, and he shook his head in response. "I'm afraid I do not."

Qin Ye smiled as he replied, "Ironically, the world's earliest star chart wasn't made by anyone from Europa or Usonia, where astrology is most popular. Instead, it was drawn in 600 AD by the Cathayan astronomer, Li Chunfeng, but it's currently being showcased in the Britannian Museum."

"I'm sure the three death gods of Northern Europa would be open to exchanging it for something."

"There's no need for that," Qin Ye replied. "The mortal realm is the mortal realm, while the underworld is the underworld. This is not an artifact of the underworld, and...