C174 Who exactly is the jade bracelet?

Red Dust slowly walked from outside the Punishment Court to the center of the hall. He knelt on the ground and respectfully said, "This humble one, Red Dust greets you, Sir."

"Reddust, how did you know when Shang Ling'er fell down from the window and died?" Nanhai asked as he looked at the red dust.

"Reporting to my lord