Dark City and Bright City, Radiant Sword Qi Piercing the Heavens

Upon hearing this, a question mark could not help but appear above Su Changge's head.

"What? Underground?"

Su Changge was deeply puzzled by this.

But judging by the way Heart Transformation Ancient City had emerged—

Had it not originally been beneath the earth?

There was actually another region underground?

Seemingly noticing Su Changge's confusion, A Xin explained, "I slept for too long, so A Xin does not know the specifics very well. What I know is only superficial."

"According to the memories in my mind, Heart Transformation Ancient City was actually divided into two parts. You could roughly call them Bright City and Dark City."

"Bright City and Dark City?"

Su Changge frowned slightly and pondered. "According to what you mean, the ancient city we are currently in is actually Bright City?"

"And the unknown region beneath the ground is Dark City?"

A Xin nodded. "Bright City and Dark City can also respectively be called Human City and Iron City."

"In the Master's vision, Heart Transformation Ancient City was meant to allow us Divine Iron Creatures and human cultivators to live together."

"The surface region where we are now was for human cultivators to live in, while the underground world was for Divine Iron Creatures."

"You can understand Heart Transformation Ancient City as a spherical city. The two different regions corresponded to two hemispheres."

Hearing this, Su Changge could not help but sigh in amazement.

He truly had not expected Creation Immortal Emperor's ideas to be so far ahead of his time. He had never even seen a city constructed in such a style.

Combined with the incredibly profound Divine Iron Mechanism Art, it was practically a cultivation civilization entirely different from this world.

After marveling for a while, Su Changge asked again, "Then how are we supposed to enter