Bai Jinxiu's letter detailed that she had discovered the connection between King Liang's residence and the Wang family of Jiuqu Alley. They were engaging in child trafficking. Bai Jinxiu had continually had people monitoring both the Wang family of Jiuqu Alley and the steward of King Liang's residence.
The Hidden Guard sent by Bai Jinxiu had witnessed the two parties meeting secretly. King Liang's steward said they needed boys and girls under ten years old and would need ten boys and ten girls next time. Then, the Wang family brought five boys and five girls into King Liang's residence quietly.
Bai Qingyan burned the letter. Once it was almost completely burned, she put it into the inkstone.
What did King Liang's residence want with the children?
The Emperor had already sent Hidden Guards to watch over King Liang's residence. The Emperor must have known about King Liang bringing in the ten children.
Could it be... related to alchemy?