C626 The limits of killers

When the paper slip was handed to Cao Xiaolei, Cao Xiaolei racked his brain for a long time. Unfortunately, he was not Bond, nor was he a talented person like Holmes, Ke Nan Di Ren Jie. In the end, he could only give up on trying to hurt his brain cells and use a different method to find the person behind the scenes.

Although he didn't know who sent the killer