I'm not sure. It depends on how it's presented and what the creators claim. Sometimes movies or books labeled as such might have elements of truth mixed with fiction.
The Forgiven (2022) is purely fictional. It was written to engage and captivate the audience through imaginative storytelling rather than being based on real events.
The novels recommended for transmigrating to atone for his sins were " A Daughter in My Family Has Not Grow Up " and " The Devil's Body Tempering." " A Daughter in My Family Has Not Grown Up " was a story about a male protagonist who was a killer and a female protagonist who was a family member of someone he had once killed. After the male protagonist was reborn, he decided to atone for his sins, protect the female protagonist, and avenge her. The two grew up together. " The Devil's Body Tempering " was a story of youth that was filled with warmth and healing. It told the story of Bei Yao and Pei Chuan growing up together. Pei Chuan used Bei Yao's warmth and healing to atone for his past. These two novels were about redeeming their sins through time travel, so they were worth reading.
Since I don't know the exact content of 'the forgiven novel', it might be about the process of forgiving. It could tell the story of characters who have to face and overcome grudges, either in a family context, among friends, or in a larger community. Maybe it shows how forgiveness can transform people and their relationships.