There may be a protagonist who is highly skilled at pretending and is likely the focus of the story. There could also be antagonists who oppose the protagonist's actions or motives related to pretense. And then there might be some supporting characters like friends or family members of the main character who are affected by the whole pretense situation.
Well, without having read 'the great pretender novel', it could potentially center around a person who is really good at deceiving others. Maybe it shows their motives for pretending, like trying to gain power, love or wealth through false pretenses. It could also explore how their actions affect those around them, whether it causes drama, betrayal or unexpected revelations in the story.
The report letter in Big River 2 was written by Father Cheng. Mr. Cheng realized that Song Yunhui was no longer under his control. In order to threaten Song Yunhui, he used some extreme methods to write this report letter. However, he had underestimated Song Yunhui. This report letter did not control Song Yunhui. Instead, it deepened…
I don't have information about who specifically wrote 'the great fanfic' as there are so many fanfics out there and without more context it's hard to tell.
In the 'great pretender light novel', the themes could involve moral ambiguity. When characters pretend, they may have to cross ethical boundaries at times. Additionally, the theme of redemption might be present. Some characters may seek redemption through their experiences related to pretense.