Lee Hyeonwook is the CEO of a talent agency that scouts and trains idols. He is a brilliant songwriter-producer who appears cold and indifferent on the outside but is sensitive and kind-hearted. Hyeonwook lives in great difficulty as he unable to let go of his ex-girlfriend who dies in an accident he witnesses firsthand. His ex-girlfriend’s sister, Yoon Sena, moves to Seoul in order to pursue her songwriting career and meets Hyeonwook who helps her achieve it. In the midst of healing through music, they fall in love.