The male protagonist always liked to bully the female protagonist. Later, the female protagonist fell in love with the male protagonist's friend. The male protagonist was very sad. Once, he got drunk and forced the female protagonist to leave on a rainy night. This plot is more common and is often called sadomasochistic or sad love because the protagonist's emotional experience is very painful. In novels, this kind of plot was often used to show the contradictions and struggles of the protagonist and the depth and complexity of their feelings. Through this plot, the readers could feel the emotional pain of the protagonist and the entanglement and struggle between them. The scene of the female protagonist leaving on a rainy night was also a common ending. It could be used to express the loneliness and pain in the protagonist's heart and that they could not escape the control and shadow of the male protagonist. This kind of plot could also resonate with the readers and let them feel the emotional world of the protagonist.