Cui Ye from the Camp Repair Department left evidence to protect himself. Now only Cui Ye and Tang Xuan's evidence has surfaced, but there's none from Secretary of the Imperial Secretariat Luu Shizhong.
To save his life, what will he do?
He surely conveyed the matter of the metal box containing evidence against the Secretary of the Imperial Secretariat.
Then Luu Shizhong found out there was evidence outside, and then approached Zuo Yuan, his big confidant, hence Zuo Yuan coincidentally came to Wenlin Garden.
This also indirectly shows that the Secretary of the Imperial Secretariat and Zuo Yuan are deeply tied, otherwise, how would the Prime Minister personally appear for the Secretary of the Imperial Secretariat?
That's one point, and there's another.
There are many people who convey messages to Tang Bai and Zuo Yuan: Cui Ye, Regent's Mansion, Seventh Prince, Fifth Prince, or... the Crown Prince.
Anyone who has seen the evidence in the metal box might know.
