Jack is the boyfriend of Jeanie and he works for a mob boss Salvatore Valestra. Harley was criminal and a well known one too who was very rich. She was planning on marrying Guy Kopski so they can move away together and she can become a good person. But things take a turn and changes the lives of Jack and Harley. This story is joker and Harley Quinn's origin and it has many twists and turns on how the Jack became the joker and how Harley became the Joker's Harley Quinn.