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 is 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.