The concept of "Jekyll & Hyde" originates from the novella "Strange Case of Dr Jekyll and Mr Hyde" by Robert Louis Stevenson. It explores the duality of human nature, illustrating the conflict between good and evil within a single individual. Dr. Jekyll, a respected scientist, creates a potion that transforms him into the malevolent Mr. Hyde, allowing him to indulge in immoral behavior without facing societal consequences. This duality represents the struggle between the civilized self and the darker impulses that exist in everyone. The story serves as a cautionary tale about the dangers of repressing one's darker side, ultimately leading to a loss of control and identity.