Following Xu Youcai's confession, Wang Yu's murder suspicion has been removed. By all accounts, everyone should feel happy about this, yet they couldn't relax. Without catching the real culprit, the case remains unresolved.
In addition, Xu Youcai clearly implicated Zhong Han in this case.
Based on the existing evidence, they could completely arrest Zhong Han, but Zhao Tianyang dared not act rashly.
Zhong Han was the head of the Arrest Bureau, and as the deputy head, Zhao Tianyang had no authority to touch him unless he had the support from the superiors, that is, the consent of the Yamen leaders. In theory, catching a corrupt bureau chief should garner full support from the leaders, but there's a complication.