I'm not sure which specific 'False Fiance Secret Story' you are referring to. There could be many stories with such a title or concept. It could be about someone who pretended to be a fiance for some ulterior motives, like financial gain or to deceive family and friends.
Well, without more context, it's difficult to detail the 'False Fiance Secret Story'. However, generally speaking, it might involve a person who fakes being engaged. Maybe they create this false identity to get closer to someone, or perhaps they are part of a scheme. For example, they could be trying to infiltrate a family for inheritance reasons. They would have to keep up the charade, which would involve lying about their relationship history, future plans together, and so on.
The 'False Fiance Secret Story' could be really complex. It might start with the false fiance approaching the victim in a very charming way, making them believe they are in a loving relationship. As time goes on, the victim may start to notice some strange things, like the fiance being evasive about their past, or not having any real friends or family to introduce. There could be a big revelation at the end, like the false fiance was hired by someone to cause harm to the victim, either emotionally or financially.