章 463: Chapter 339: Attacking While Clearing

Feng Yun pondered for a long time.

Were it not for the slight tightening of her hand on the letter, the black brightness deep in her eyes, one might almost think she had no reaction to this matter.

"Is this the reason the Princely Heir wants to take me to Yunchuan?"

Chunyu Yan smoothed out his clothes, his expression indifferent.

"The tunnel is not yet unblocked, Yunchuan still needs your support. You have not revealed the method of making coal balls from graphite, and I do not want there to be any mistakes in this business."

He deliberately did not mention concern.

His proud exterior concealed an unease within.

Feng Yun showed little change of expression, turning the letter over and over to check the markings, as if to confirm the authenticity of the content.

This type of secret letter, to avoid exploitation, would always have a mark in a particular place that only insiders would understand.

This letter was no exception.