演艺公司AnA代表李贤旭（Rain 饰），是一名颇具名气的作曲家兼制作人，他风流倜傥，才华横溢，被人称作热门歌曲制造机，滚滚而来的金钱让他过上世人欣羡的优渥生活。但是也许只有他自己，知道自己心中的痛苦有多深。三年前一场事故，带走了贤旭最爱的女友素恩，与素恩一同逝去的还有贤旭那令人惊叹的音乐才华。直到某一天，一通宿命的电话再度改写了贤旭和另一个女孩的人生。那个女孩名叫尹世娜（郑秀晶 饰），她正是素恩的妹妹，此时还只是一个为了生计疲于奔命的丑小鸭。贤旭在世娜身上看到了女友的影子，更发现了其体内所蕴藏着的惊人的音乐天赋。 　　沉溺已久的天才音乐人，因天籁般的歌喉重现焕发了生机与活力……Hyun Wook (Bi) is the CEO of a talent agency that scouts and trains idols. He is a brilliant composer-producer who appears cold and indifferent on the outside but is sensitive and kind-hearted. Hyun Wook lives in great difficulty as he unable to let go of his ex girlfriend who dies in an accident he witnesses first hand. Said ex-girlfriend's sister, Se Na (Krystal Jung), moves to Seoul in order to pursue her music-composing career and meets Hyun Wook who helps her achieve it. In the midst of healing through music, they fall in love.