Floch does indeed die. His fate is a significant plot point in the manga's storyline. The circumstances surrounding his death add to the overall tension and drama of the series.
Without more information, it's hard to say who Caroline and Nicolas are exactly. They could be ordinary people with an interesting story, or they could be characters in a fictional narrative.
Well, without further information, it's hard to say exactly what Nicolas' secret story might be. Maybe it has something to do with a family heirloom or a long - lost friendship that he has never shared with anyone. It could also be a dream he has that he's too shy to tell people about.
Yes, there might be some. Some authors might be inspired by Nicolas Cage to create fictional romance stories involving a character similar to him. However, it's not a common or mainstream genre specifically dedicated to Nicolas Cage romance novels.
I'm not sure specifically which 'origine nicolas secret story' you are referring to. It could be a personal story related to someone named Nicolas, or it might be a very specific tale within a certain community, family or context.