Han Yiyao took things into her own hands and ran away. Although Zhou Heng didn't think she would return to the Han Family, if he wanted to find this woman, it was best to visit the Han Family and ask around.
Otherwise, only after the news of his victory over Ying Cheng'en spread would that foolish woman think the coast was clear and come out to meet him. However, even though Zhou Heng was very confident, achieving a breakthrough to the Nascent Soul Realm was not a goal that could be achieved in a short time.
So, he should ask around for information.
The person most likely to know Han Yiyao's whereabouts would be her aunt, Han Yulian. The two women shared similar misfortunes and were probably very close.
The Han Family was not in the Imperial Capital but in Yuhua City.
Yuhua City was a major city in Bright Moon Country, and the Han Family was the ruling family there, with a Spiritual Sea Realm Expert, the Old Ancestor, seated in authority. In Yuhua City, they were a behemoth.