"Yes I admit it, as unprofessional as it sounds, I have fallen in love with my patient. Pretty crazy, huh?" Before becoming the Joker's henchwoman and girlfriend, Harley Quinn was once known as Dr. Harleen Quinzel. Working as a psychologist at Arkham Asylum, she hoped to write a book about all the super criminals incarcerated there. However, overtime, the Joker manages to develop a personal relationship with Harleen through lies and fabricated stories, which eventually turns her into the Harley Quinn we all know and love.