The male protagonist sacrificed himself for the happiness of the female protagonist, but the female protagonist did not know until the end did she understand the male protagonist's feelings. 2. The female protagonist was wrongly accused and imprisoned. The male protagonist never left her side, even if the female protagonist did not know that she had wronged the male protagonist. The male protagonist and the female protagonist used to love each other, but for some reason, the male protagonist was forced to leave the female protagonist. After many years, the male protagonist came back, but the female protagonist had fallen in love with someone else. The female protagonist had to break up with the male protagonist for some reasons. However, many years later, the female protagonist returned to the male protagonist's city and found that the male protagonist was already married and had a child. The male protagonist and the female protagonist used to be together, but for some reason, the male protagonist was forced to leave the female protagonist. After many years, the male protagonist returned to the female protagonist's city and found that the female protagonist had a new lover. The female protagonist had to divorce the male protagonist for some reasons, but many years later, the female protagonist returned to the male protagonist's city and found that the male protagonist had passed away. The male protagonist had to divorce the female protagonist for some reason, but many years later, the male protagonist returned to the city of the female protagonist and found that the female protagonist had passed away. The female protagonist had to separate from the male protagonist for some reason, but many years later, the female protagonist returned to the male protagonist's city and found that the male protagonist had become a stranger. The male protagonist had to separate from the female protagonist for some reason, but many years later, the male protagonist returned to the female protagonist's city and found that the female protagonist had become someone else's wife. The male protagonist and the female protagonist were once in love, but for some reason, the male protagonist was forced to leave the female protagonist. Many years later, the male protagonist returned to the female protagonist's city, but found that the female protagonist had a new family, and the male protagonist could no longer join their family.