Come on, mom. In which episode did Yu Siyu die?

After the death of episode 16, Yu Siyu took Yu Youwei and Han Ming to the villa by the sea, cooked a table for Yu Youwei, which Yu Youwei loved, and gave her a model sailboat from Ai Jia as a birthday present. Yu Siyu sincerely wishes them both happiness. She gave Yu Youwei to Han Ming as her daughter. And this happy scene is so dazzling in Ding's eyes. Seeing from a distance that the three of them were as close as a family, she was jealous. After Yu Youwei and Han Ming left, they went to the seaside to have a blow and followed. Seeing this, Ding roared hysterically, complaining that she never took her as a daughter and helped Youwei steal her sweetheart. She told Yu Siyu that she must be as miserable as Yu Youwei. Yu Siyu begged her to let Yu Youwei go. Ding was blinded by jealousy and anger and accidentally pushed him off the cliff. Although Ding hates it, after living together for so many years, she has long regarded it as her own mother, and she doesn't want to kill it. Ding grabbed the hand and struggled desperately. Han Ming saw that the model sailboat was made by Ding Tan and Ding. Yu Youwei felt that the gift was too expensive and should not be accepted, and insisted on returning it. She searched all the way, heard the voice of He Ding, saw the dangerous situation, ran to help, and grabbed the other hand. Originally, two people can save Yu Siyu together. However, when Ding Yijia saw Yu Siyu's maternal love for Yu Youwei, she chose to give up. She pretended to call someone. When she turned around again, Yuwei failed to stop Yu Siyu, but Yu Siyu fell down. The scene of Yu Siyu falling off a cliff stimulated Yu Youwei, and all her lost memories came back. She remembered that she was Ding, not her mother. She hurried to see Yu Siyu, who had no hope of treatment. She has been holding her breath waiting for something. At the last moment of Siyu's life, the evil mother and daughter can recognize each other. Yu Siyu told Yu Youwei to protect himself. Forgive Ding, only ask her not to be difficult in the future. Yu Siyu's death aroused Yu Youwei's anger. Even if her mother forgave Ding, she couldn't forgive her. Even if Yu Youwei regained her memory, Ding insisted that she was Ai Jia. Han Ming rushed to the hospital, and at the moment when he heard that Yu Youwei claimed to be Ding, he explained the kindness Yu Youwei brought him and the similarities between Yu Youwei and Ding when they were children. Just looking at each other, Han Ming believes that Yu Youwei is Ding. When Ding Huaiyuan was not at home, Ding Chi was busy planning to sell Shi Ding's sailing fleet, develop products and convince the company's major shareholders with profits. As long as these are completed, she can ruin Ding Huaiyuan's hard work and achieve her goal. However, Yu Siyu's death is likely to make Ding Huaiyuan return home early. Once this matter is traced, the truth of the exchange of money will also be exposed. Ding Chi blocked the news of Yu Siyu's death and immediately arranged for Yu Siyu's body to be cremated.