Lan Ruobing did not doubt anyone she hired and would not use those who were untrustworthy. Since Lin Rou had performed flawlessly for the princess, the latter did not suspect Lin Rou of betrayal.
Still, Su Binglan did not expect the problem to lie with Lu Zuidie. When the emperor declared the marriage between Lu Zuidie and Chu Luiyan, the former acted as if she had no choice.
At that time, Lan Ruozhu felt guilty for not protecting Lu Zuidie. However, Duke Lu had agreed to bestow the marriage, and Lan Ruozhu was in no position to do anything.
After careful consideration, Su Binglan felt there was something amiss about Lu Zuidie not having a choice. Perhaps the latter had already contacted the Crown Prince in private back then.