The baton touch has gone to Ailee as she dropped the fourth OST, "Because It's Love," to both heartwarming and quirky drama 'Come Back Mister,' starring Rain and Lee Min Jung.

The song is not quite a ballad - rather a mid-tempo track that captures all the emotions of a ballad while keeping things slightly upbeat for a hopeful, pleasant feel. �The talented singer softens her vocals from its usual powerhouse belt to perfectly relay the emotions of love and inner turmoil that the drama captures with its story.

Listen above and feel free to let your body sway back and forth to her cooing.