Mary Stayed Out All Night is a Romance Comedy. I can't forget the first moment that they meet here, which she almost hit him in a car accident. That scene is so cute. Wi Mae-ri (Moon Geun-young) is so sweet and so innocent... i like her. But what i love most is Kang Mu-gyul (Jang Keun-suk), he is very suitable for the role of Kang Mu-gyul. The way he perform with his band is remarkable. My fave scene is when Kang Mu-gyul dedicates the song "Hello Hello" for Wi Mae-ri during the promotion of Wonderful Day Drama. I love ALL the sound tracks so much.