I'm not sure. It depends on how the story is presented and the background information provided. Sometimes, stories labeled as such can have elements of truth mixed with fiction.
Well, to understand 'Prey on the Master' manhwa, first, familiarize yourself with the setting and the main characters. Also, notice the themes and the way the story progresses. It'll all come together as you keep reading.
A 'rewind novel' could potentially be about a number of things. It might be centered around a character who has the ability to rewind time, either physically or through some sort of mental power. The story could then follow their adventures as they use this power to change the course of events. Or perhaps it's a more metaphorical 'rewind', where the narrative jumps back and forth in time to tell a complex story, revealing different aspects of the characters and their relationships at different points in time.
The movie 'Rewind' is not a true story. It's likely a product of the imagination of the filmmakers, crafted to engage and captivate the audience with an interesting plot and characters.