Dancing with the shadows

Kim Nari meets a dreamy hunk at the most wrong timing. But even though the timing was off she still was able to get close to him and even went through all the hardships of life together with him. Nari falls in love with him but the boy suddenly disappears into thin air, only to later appear back in her life with no memory of her. Will the boy be able to get back his memory or would he keep on living his life with shadows covering his core and important memories of the past?