My Lovely Girl (2014)

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, kind-hearted, and unable to let go of his girlfriend, who died in an accident he witnessed first-hand. Her younger sister Se Na (Krystal Jung) has moved to Seoul to pursue her songwriting career, and Hyun Wook helps her achieve it. In the midst of healing through music, they fall in love.