Gustafsson was raised in Arboga, a small town in Sweden by his father who was a farmer. He had a troubled youth which led to him ending up in fights often as a teenager, he was convicted for it for the first time when he was 15. As an 18-year-old in 2005 he was sentenced to prison for aggravated assault, once again as a result of fighting. He was released in 2006, turned his life around, got back to training, found MMA and moved to another city to leave the trouble behind him. He has credited getting involved in MMA that finally changed his life for the better. This is his first book.