Seeing Zhou Tian's expression, Xia Wan knew that she had guessed right. After all, this was more in line with the actual situation. If Li Yan and Zhou Xiaorou's family backgrounds were equal, and Li Yan himself was very outstanding, he wouldn't do anything to harm her even if he didn't love her... unless Li Yan no longer loved Zhou Xiaorou, but he still needed help through his marriage with her. For example, he could get help from her father, Zhou Tian.
If she didn't discover Zhou Xiaorou's poisoning, she would have continued to be harmed. Furthermore, the symptoms on her body were very weak and could not be detected by the current level of medical treatment.
And when Zhou Xiaorou was sick, Li Yan took good care of her. Thus, Zhou Tian naturally felt that Li Yan treated Zhou Xiaorou very well. Even if Li Yan married someone else in the future, Zhou Tian would feel that it was only right. He would even provide him with a lot of help in his work.
