Although Qingdai had provided Chen Yu with a lot of information, it didn't really mean much to him.
The information certainly belonged to the Tashiro Family's secrets, and could even be considered very important secrets, but the main point was still that the Tashiro Family bore ill will towards Chen Yu, and both Tashiro Nanao and Qingdai were after the patent and formula for his broad-spectrum anti-cancer agents. And these were exactly the things that Chen Yu had already seen through.
Perhaps Qingdai, as she said, disliked her family's lackluster performance and had therefore always exhibited vulgar methods, yet it could not be ruled out that this was all part of her calculated plan. The purpose was to get Chen Yu to let his guard down, then confess two already exposed truths to win his favor and reverse his impression of her.