They say that you will never forget your past. And if you do, it will always remember you. Hakyeon has been in love with Seohyun for a 4 years. Seohyun, who only loves Hakyeon as a friend, gets into a car accident and loses everything about her memory. Even if Hakyeon tries to make Seohyun remember him, she says she has absoultly no idea who he is. Will Hakyeon suscced? Or will he have to live on with his life without Seohyun?