Responses
Well the plot is this world is set from a novel where the Princess is the Main Character who regressed back in time (regression type story). So the plot about Reibler as the star of high society in the past, is part of the original novel as a backstory of the Princess (the MC) but when the Princess regressed she tried to change her fate and achieve a happy ending.
At least that's what in their original novel is,
The plot of this manhwas is about a person from another world reincarnated to that novel in same timeline with the Princess in her 2nd life. So Reibler (our MC) has memories of both past and present timeline.
And correct me if I am wrong with all of my expertise from ready these manwha, when they keep on referencing the original story while not making it clear if they reincarnated into the story or the character, majority of the time it because they turned back time and as result of this they remember their previous life as an story. But I don’t know if this iOS the path this story is taking