Watched the third Mandarin movie again

Kim Joo (played by Yoon Hae-young) and Eun-joo (Kim Ji-soo) ) are a pair of sisters. Jinzhu lives with her mother, while Yinzhu lives with her grandmother. Therefore, when her mother takes Yinzhu back to her, Jinzhu, who has been pampered since childhood, is very dissatisfied. In daily life, her mother always prefers Jinzhu. By chance, Eun-joo met the young prosecutor Park Ki-jung (played by Zheng Baoshi). His kindness and bravery won Eun-joo's favor. Eun-joo's simplicity and beauty also moved Park Ki-jung, and the two soon came together. At the same time, Ji Zheng's younger brother Ji Feng was also pursuing Jin Zhu, and his hard work paid off, and he finally successfully embraced the beauty. Unexpectedly, the seemingly happy love between the four people was strongly opposed by Ji Feng and Ji Zheng's grandmother (played by Shi Meizi). Yin Zhu and Ji Zheng were forced to break up.