C99 Why should a man leave a shred of a mark on a dog?

Why should a man leave a line for a dog?

The matter was so heated that no one could cover it.

Peppermint's second uncle finally picked up the phone, "Bureau Chief Zhang, I hope you can give the commoners a satisfactory answer."

"Don't worry, I will personally supervise this case and investigate it to the end. I will not disappoint my leader's expectations