I'm not sure specifically which 'Secret Story' you are referring to. There could be many people named Andreia Leal. It might be a character in a particular TV show named 'Secret Story' in some region, or it could be a personal story within a specific community that is known as the 'Secret Story'.
Since we only know the title 'the real megan is missing story', it's difficult to say exactly who Megan is. She might be a young girl from a small town, or a woman living in a big city. Maybe she has a family, friends, and a job that are all affected by her disappearance.
There's not enough information to know exactly who Megan is in'megan is mossing real story'. It could be a common name for a fictional character in a story that is being developed, or perhaps it's a real person that the speaker is familiar with but hasn't provided enough context for others to identify. For example, it could be a Megan from a school project where a real story was expected but is missing.
I'm not sure exactly who Megan is without watching the story in detail. But she's likely a person who has a very high weight and is on a journey to change her life in the context of 'my 600 lb life'.
It's hard to say for sure. It depends on how it was written and presented. Maybe the author drew inspiration from real life but changed some details for the sake of the story.
It's also possible that Andreia Leal is an antagonist in the 'Secret Story'. She could be the one causing trouble, trying to keep certain secrets hidden from others for her own benefit, or actively working against the other characters in the story to achieve her goals.
I don't know who the author of the 'megan novel' is. There are so many novels out there, and without more information, it's impossible to determine the author.