If Mrs. Sun was the madman's wife, then it was perfectly normal for her to suspect that Jiang Yao was her daughter.
If that were the case, then where did Sun Xiaoshan come from?
Lu Xiaoxiao said that the madman's wife had given birth to a daughter, not that she had given birth to a pair of twin daughters.
Lu Xingzhi's heart trembled when he heard Jiang Yao joked with him flirtatiously on the phone. It was a good thing that Jiang Yao did not suspect anything.
However, the fact that Mrs. Sun had taken her hair meant that she was suspicious. Mrs. Sun was also investigating Jiang Yao.
Lu Xingzhi's heart had always been troubled. How relaxed was Jiang Yao's smile? How heartless was she in making fun of the Sun family's mother and daughter duo? If she discovered that she was not the Jiang family's biological daughter, how heartbroken would she be to learn that her biological parents had abandoned her? How depressed would she be?