C163 What does this mean

After a slight hesitation, Shen Zhenhu said to Zhang Xin, "Alright, let him go. However, if I discover that she has come here a second time, it won't be that simple."

Yan Xue who was at the side also heard what Shen Zhenhu said very clearly, thus, he did not say anything, and left under everyone's gaze.

...

Right after Yan Xue left, Shen Zhenhu arrived in front of Zhang Xin and said: "Kid