ZYL must have a sense of him as a good, decent person. So why worry? Especially given there isn't, like in the drama, all the suspicious activity around multiple crime scenes.

Great point, especially the absence of the crime scene stuff! But he did note that Shen Wei is apparently powerful enough to deceive the entire SID, so I wonder how sure he can really be.

In the drama, doesn't he get ZYL as well? I thought that was where CSZ's thumbs up comes from.

Oh duh, you're right! I'd completely forgotten about that! :D