① Music = About technical, 'Mr.Mr.' isn't a song of R&B. It's more of a dance song with a mixture of R&B. The only thing that 'The Underdogs' did was to link Soshi's song with a flavor of R&B. It will be an easier and easy digest song than last year's 'I Got A Boy'. Obviously, they never forget of adding unique lyrics as well as addictive melodies.

② Performance = The focus of the dance will be their formations. The girls will move in many formations with the music. There won't be any props, the performance will be shown solely through the dance. 

③ Style = They won't pull themselves to evolve in sexy battle. It won't be 19+. Instead of showing skins, they will use their personalities. You will see fashion is the crucial thing in the teaser. Yoona's dress, the cuteness of Taeyeon, an unique style of Seohyun. Each member will dress up in very unique outfits.

④ Music Video = The concept is 'Mystery Girl'. The thing that you can see in the teaser. It's not vivid to know where the setting is in a hospital room or a laboratory. Did you think with the male models, there would be some sexy scenes? Hurry up in forgetting it. He is just an additional feature.

⑤ Album = Girls' Generation will have a comeback with a mini album. The plan is there will be 4~5 songs including the theme song. With an unique concept. Classic dances of Girls' Generation will be included. They will also try a new genre. You can also feel the maturity in singing of Girls' Generation.

⑥ Participation = Music, performance, style, and all the steps, all the girls evolve by giving suggestions. Especially while the recording. They even consulted with the songwriter for additional details about ad-libs. The girls also worked the visual director to pick the best suitable outfits for each member.