2AM Nothing shows a band's true talents that taking a hit pop ballad and flipping it into an a cappella masterpiece. Though Big Hit Entertainment's youtube channel, the boys of 2AM shared a very sweet live performance of their latest hit, "One Spring Day." Tragically, the video lasts only 40 seconds, but it shows off some insanely gorgeous vocal harmonies.  The boys have been making the rounds recently, appearing on M! Countdown and Inkigayo, both times performing the hit single. Take a look at the a cappella treatment below: Ready to hear more?