Yu Rong didn't know that Zhou Manqing was up to no good again. After that fortune-telling session, she had obediently stayed at home and immediately resigned from her position as Zhou Manning's manager.
When Yu Rong found out that Zhou Manning had murdered Manqing, it wasn't like she hadn't thought of cutting off ties and calling the police. However, she didn't have any evidence, even if she knew that Zhou Manning was the one who had killed Manqing. If she rashly accused Zhou Manning of hurting Manqing, who knew what tricks Zhou Manning might have up her sleeve. It was fine if it was just her; she wasn't afraid to sacrifice her life to seek justice for Manqing. However, if she died, what would happen to her mother and her children?
What she was most afraid of was the deranged Zhou Manning killing her children, so Yu Rong could only pretend that she didn't know anything.