Zhou Ming nodded his head, "Exactly. Zhao's Group has a secret research institute in Yun City that seems to specialize in studying ancient maps and ancient texts... And this map is of utmost importance. I spent a great deal of money to obtain a copy..."
Chen Tang stowed away the photocopy and bowed slightly toward Zhou Ming, "Head of the Zhou Family, this map is very important to me, thank you! However, Head of the Zhou Family, you didn't invite me over today just because of this map, did you?"
Although Zhou Ming knew of the Chen Family Cipher, Chen Tang was certain that Zhou Ming absolutely couldn't know the true content of the cipher. Hence, even if Zhou Ming knew that there was something very important in the map cipher, he couldn't possibly know that it was related to the Chen Family Ancestral Mausoleum.
Therefore, Zhou Ming giving him this map must be an act of currying favor, having a request for Chen Tang.