Jiu Tang City was the biggest city in He Dong Province.
Ye Mo went there right after sending Su Jingwen and Tang Beiwei away since he had promised to help Yi Jiuhe. Although he was very busy, he truly approved of Yi Jiuhe's character. There were a lot of wealthy people, but not many of them were generous.
When Yi Jiuhe bought his necklace, he hadn't known the true value of it. He bought it in the first place due to his love for his daughter, but also to help out Ye Mo.
As for going to Beijing, Ye Mo called Han Zaixin and found out that it was something concerning the search for the Space Flower blueprint. He immediately lost interest. Before Han Zaixin could persuade him, he said he had no time and put the phone back in his ring.
Ye Mo didn't know where Yi Jiuhe's home was, so he could only ask people on the road about where Jiuhe Corporation was.
It turned out to be really easy to find out, as they were the biggest corporation in that region.