The sudden inquiry almost caused Qian Cangyi to lose his composure. However, he had used this trick of deception many times before and was able to react instantly when it was used against him.
He knew that what Fan Yuantang had said was just to trick him, to make him slip up; otherwise, the question would not have been "Did you find out," but "Did you find the corpse in the loft."
The fact that Fan Yuantang did not clarify his question, omitting a part, was also to prevent the question from revealing information to Qian Cangyi.
From this, Qian Cangyi could infer that Fan Yuantang did not want the corpse to be discovered and that he still needed to cover it up.
Even though the Liang Ping that Qian Cangyi was pretending to be was just a ten-year-old child, Fan Yuantang did not want to expose himself, which meant that it was still safe for now.