Kim Bowoo is an aspiring singer blessed with a naturally beautiful voice and a talent for songwriting, but there is one major problemāhe simply cannot hit high notes. Then Yoo Rae-in, a handsome younger piano genius, suddenly appears and promises to help him reach those elusive notes by any means necessary. However, Rae-inās rather unusual training methods soon have Bowoo wondering whether itās really his vocal range thatās about to be pushed to its limits.