Taeyang is a normal guy who isn't famous but has a passion for music. He works in his father's business as a mechanic, and is learning everything about it since he will take over one day. What happens when he is called to serve his time in the military? What if on his last few days he meets the girl he lost when he was in high school? Will she wait until he is a free man or will she move on like he did all those years ago?