The staff said, "People mostly think of male heroes when they think 'hero', and we wanted to give a twist to that line of thought. However, we had a lot of obstacles to find models who would fit the role of the heroes. It's hard to find an image that can express the charisma of a hero and still pull off the beauty of a female hero. We chose SISTAR among a wide variety of possible candidates. We decided that SISTAR's image as a group as well as the members' colors would fit the heroic characters well."