Many knew that Qing Cui was illiterate. Even if she found the letter, she would not know who wrote the letter. The reason why they were still arguing was that Qin Wanru had tried to skirt the topic so no one had to start discussing who the letter was addressed to.

However, it seemed at the moment that Qing Cui knew.

The only possibility was that Qing Cui had long known the content of the letter, but who would have tole her?"

Looking terribly pale, ...