C879 Surrounding Song

Hua Chenghui clasped his hands behind his back and began to pace back and forth.

"Originally, Xiao Yan would say it first. This is a trade secret and it is not allowed to be revealed easily. However, on the account of our brotherly relationship, I'll let you know a little. " Hua Chenghui stood opposite to Huang Xing, his sharp eyes seemingly wanting to pierce through the other party's body