It was an ancient drama where the younger sister got married in place of the older sister. It turned out that the male lead didn't like the female lead, but he gradually liked her. In the beginning, he even shut the female lead off.
This plot is more common in ancient TV dramas or novels, such as the following novel plot: In an ancient dynasty, there was a young woman called the heroine. Her sister was chosen by the emperor to marry as a princess. However, the female lead was unwilling to leave her hometown. She wanted to marry in place of her sister. Therefore, the female lead was arranged to marry a young man called the male lead. In the beginning, the male lead did not like the female lead to think that she was just a substitute. The male lead had his own interests and plans. He did not want to involve the female lead in his political struggles. Therefore, the male protagonist locked the female protagonist up and did not allow her to communicate with others. However, as time passed, the male protagonist gradually discovered the beauty and wisdom of the female protagonist and began to develop an interest in her. The male protagonist began to pursue the female protagonist, but at first he did not succeed because of the identity and status of the male protagonist. He could not communicate directly with the female protagonist. However, the male lead did not give up. He approached the female lead in various ways and finally got the female lead's approval and affection. The male lead began to pursue the female lead passionately, and the two of them ended up together. However, in the process of the male protagonist pursuing the female protagonist, the male protagonist also experienced some growth and changes. He began to realize that his views on politics and power were wrong and worked hard with the female protagonist to change his thoughts and behavior. In the end, the male and female lead got together and became a legendary couple in political history.