All he could say was, "Sifu, Princess Jin is an open and observant person. She is also a righteous person. I believe that she is only here to understand the situation at hand. She has no ill intentions. There is no need to be too wary of her."
If he was too cautious, he was worried that it would be difficult for Sifu and Princess Jin to be together in this lifetime. At the very least, it would be very difficult for Xue Yan to see them not get together.
At this moment, he finally understood why Princess Jin had come here and why she had approached Sifu first.
Prince Yi was currently living in the manor, so he must have met Princess Jin there. In his previous life, Prince Yi had met Princess Jin. Even if Prince Yi did not know Princess Jin's identity in his previous life, he must have known that Princess Jin was Princess Jin in this life.
Prince Yi must have said something to Princess Jin, which was why she came here.