Jessica and Onew are childhood best friends. They treat and love each other like real brother and sister. But as they grow up, Sica fell in love with Onew. She's stopping the urge to confess on him because she dont want their friendship to end. When she already have the courage to confess on him, an unexpected tragedy happened, causing Onew to leave. How could Jessica now live when Onew take her heart together with him?