It is Qiong Yao's "The Courtyard is Deep"
"The Courtyard is Deep" tells the story of Fang Siying, a doctor who returned from the United States, who stayed behind for the sake of a little girl for whom she fell in love. I became a primary school teacher in a remote place. This beautiful and smart girl is called Bai Tingting. She has a blind father and a beautiful but vicious stepmother. In order not to let her blind father worry, the little girl endured everything her stepmother did. Gradually knowing everything about the little girl, knowing that she had poor grades and loved to lie, Fang Siying decided to help her. Fang Siying took the initiative to ask for tutoring for the girl. When Bai Tingting's father, Bai Peiwen, found out, he insisted that Fang Siying move to his house and become Tingting's tutor.
When Fang Siying arrived at Bai's house, she found out that Bai Peiwen had prepared a special room for herself. Fang Siying was shocked. Bai Peiwen asked her if she was satisfied with such a room, but Fang Siying could only say that he didn't have to be. A few days later, Bai Peiwen's wife returned home. She didn't understand why this neglectful husband doted on a tutor so much, and broke his own rules by filling the house with roses. She made things difficult for Fang Siying and hoped that she could leave, but Fang Siying stayed because of Bai Peiwen's plea.
A few days later, Bai Peiwen sent a telegram to invite Gao Lide, a former friend. The truth finally came out. It turned out that Fang Siying was Zhang Hanyan, the ex-wife that Bai Peiwen loved deeply and thought she was dead.