I'm not sure specifically what 'romancham' is without more context. It could be a name, a place, or something very specific to a particular community or event.
Romancham is purely fictional. The plot and characters are made up to provide an entertaining and imaginative experience for the audience. There's no real-life basis for it.
Romancham is not based on a true story. It's likely the product of the author's imagination and creative writing skills to come up with an engaging fictional narrative.
I'm not sure specifically what the 'romancham true story' is. It could be about a person named Romancham, an event, or something unique in a particular context.