As for the motive, it was naturally for the throne. Both the Second and Third Princes were competitors for the throne; eliminating either one would be profitable.
"Coroner, can anyone in Mobei Kingdom easily obtain black grass?"
The coroner nodded, "Yes, but to make black grass effective, it still requires a doctor."
Chu Qingzhi had a hypothesis. She took the silver needle Chu Xujin had given her earlier, held both ends, and pulled, stretching the needle into a thin silver wire.
Everyone was astonished.
Chu Qingzhi inserted the silver wire into the hole in the corpse's finger until it could go no further.
The tip of the wire stopped at the wrist.
Her hypothesis was preliminarily confirmed. Chu Qingzhi said to Chu Xujin, "Third brother, go find Hongjun and ask him for a hollow silver needle."
"Alright." Chu Xujin immediately went to find Yuan Hongjun, wondering if a silver needle could indeed be hollow.