According to Lin Xiaoyue's request, Su Qing had someone investigate Wen Wan, but the final result was, no clue at all.
Just like when Su Xiang had someone investigate Su Yaoqi's "person of interest", Su Qing's subordinates didn't get any background information on Wen Wan.
In the male-dominated era, a woman's name was generally not revealed, at most, she was referred to by her husband's surname as Mrs. So-and-so or Madam So-and-so.
So even if they knew the person was called Wen Wan, if someone was determined not to let her be exposed, others would find it difficult to associate her with being Song Wei's wife.
And it was the Hidden Guard left by Fanghua who was stopping Su Qing's investigation.
This kind of thing was not something they were doing for the first time.
Back when Fanghua was the Eldest Princess, such a task was already assigned, to prevent anyone from inquiring about Wen Wan's whereabouts, including the Emperor and the Empress Dowager.
