Tang Jizhong needed the "knife" that was Sha Qiankun!
He personally visited the Sha Family Gang and explained the situation to Sha Qiankun. Upon learning that his only son, Sha Tonghai, had died, Sha Qiankun almost went mad.
After he knew that Jiang Xiaobai was the murderer, he wanted to kill Jiang Xiaobai to avenge his son, but Tang Jizhong stopped him.
Since Tang Jizhong did not know the extent of Jiang Xiaobai's abilities, he advised Sha Qiankun to hold off on his anger and follow his plan, assuring him that it would surely lead to Jiang Xiaobai's death.
Thus, Tang Jizhong ordered Bai Feiyu to call Jiang Xiaobai and set a trap, luring Jiang Xiaobai into it.
Jiang Xiaobai was completely unaware until he realized there was no secret room in the study, which made him suspect that Tang Jizhong might have deceived him.
"Quick, leave!"
