Betrayal can be a theme as well. When one character feels betrayed by the other, either because of false accusations or actions that seem to go against their relationship, it adds a layer of sadness. This can lead to a breakdown in their relationship and a lot of emotional pain for both characters involved.
One main theme is loyalty. The characters in 'Guardian' show great loyalty to each other, whether it's in friendship or in love. They support and protect one another through various difficulties.
The theme of forbidden love often appears. Since it's BL, in a horror context, the love between the two male characters might be seen as something that goes against the norm in the spooky world they are in. Maybe there are forces trying to keep them apart because of their relationship, which adds an extra layer of drama and horror to the story.
Power dynamics also play a role. There could be a dominant and a submissive character, which adds an extra layer of tension and excitement to the relationship. This can be seen in novels where one character is in a position of authority, like a CEO or a senior in a school, and the other is more inexperienced.
One common theme is self - discovery. The transmigrating character often has to figure out who they are in a new world and how they fit in. For example, they might discover new abilities or aspects of their personality. Another theme is the changing of fate. They try to change the original plot, especially when it comes to the fate of the male love interest.
One common theme is the power imbalance. Since vampires are often depicted as more powerful than humans, in a BL context, this can create an interesting dynamic between the two male characters. Another theme is the struggle with identity. The vampire character may be struggling with his vampiric nature while also dealing with his feelings for the other male character.
One common theme is self - discovery. The transmigrated character often has to re - evaluate who they are in a new world and new relationships, especially in a BL context. For example, they might discover new aspects of their sexuality. Another theme is power dynamics. There could be a power struggle or a power imbalance between the two male characters at the start which then evolves over time.
Power imbalance is a common theme. One character often has more control or influence over the other, which can lead to the 'abusive' nature of the relationship. For example, in some novels, a wealthy or more socially powerful character can manipulate the other.
Another sad Chinese BL novel is 'Heaven Official's Blessing'. It has a complex plot where the main characters face numerous difficulties. Their love is often tested by fate, society and their own pasts, making it a rather sad but beautiful story.
Illness or death is another theme. Sometimes one of the lovers gets seriously ill or meets with an accident that results in death. This sudden change makes the love story extremely sad. Just like in some melodramatic Chinese dramas where the female lead gets a terminal illness and has to leave her lover.
Survival and hope are also prevalent themes. The war prisoner often has to fight for his survival in a difficult situation, and the relationship with the other character can become a source of hope. In some novels, they rely on each other to get through the tough times in the prison or war - affected area.