C236 Deep Cooperation

In the afternoon of October 6th, Zhang Yunfeng, his cousin Zhang Yunran and the others flew back to Yan Jing together. Just before they boarded the plane, Zhang Yunfeng sent Huang Yong, who was far away in Yan Jing, a big attachment that was about 300mb in size. This attachment was developed by the waiter after consideration, and as for what this software was