C921 Achromatic Boundary

Three days ago, when Chen Chu returned to the Prehistoric Realm, he immediately announced that he was going to undergo closed door cultivation.

"How are you?"

The Huang Emperor asked.

"I'm fine." Chen Chu was confused.

"Then why did you go into seclusion the moment you returned?" The Huang Emperor asked.

"Because of something."

The corner of Chen Chu's mouth hooked into a smile