"Ah, when it all comes down to it, why not pursue Li Tanglu or, in other words, does Liu Zhizhong imply not to involve him?"
Firstly, it was because of Liu Zhizhong's broad-mindedness; he understood the nature of the entire incident and had the psychological quality and capability for prudent handling of such matters.
Secondly, it was because Luo Tianlin had privately sent messages to Liu Zhizhong, expressing, "Xiao Liu, you must work hard. Old Secretary Li has a high regard for you and greatly admires you. Don't let his hopes down!"
With this, Liu Zhizhong indeed felt a closeness to Li Tanglu! It was human nature and perfectly normal.
In front of Xiang Wenxin, to vie for a chance of innocence for Li Tanglu was also the right thing to do.
Not to mention, although Xiang Wenhua had given Liu Zhizhong full authority to handle the issue, Liu Zhizhong couldn't act tyrannically and ignore Xiang Wenxin's feelings, could he?