Popular rookie group, INFINITE, has been busy gearing up for their follow-up song, entitled She's Back. It's a tune that definitely fits with summer, as it has a positive vibe to match the season. The boys have recently finished promoting their debut song, Come Back Again, and performed this happy track on today' episode of M! Countdown. Their outfits and choreography were quite incredible, and the song is just too good to not listen to, don't you agree?