In 2015, Jeon starred in "The Shameless", a thriller that explores the unexpected and carnal attraction that develops between a detective and the girlfriend of the murderer that he investigates. The film was selected for the Un Certain Regard section at the 68th Cannes Film Festival and Jeon returned to Cannes for the fourth time in her career. For her performance in the film, Jeon won Best Actress at the 24th Buil Film Awards, the 15th Director's Cut Awards, and the 52nd Baeksang Arts Awards respectively. The same year, she played a blind swordswoman in the Goryeo-set revenge period drama "Memories of the Sword", her third collaboration with Park Heung-sik and her second with Lee Byung-hun.