If I was still a SNSD member, I wouldn’t have been able to do this shoot. Idol groups have to always be happy. They have to be kind, and pure, and bright. But I’m already 27 years old. I can’t forever remain a happy little girl. Someone might think after seeing these pictures, ‘Now that she’s out of SNSD, she’s taking off her clothes.’ But I’m not a little girl anymore. I think it’s okay for me to portray Jessica as a woman. Since I debuted when I was 19 years old, there are times all the restrictions and limitations can get irritating. Now, I can make all my own decisions. It wasn’t so bad deciding to come to this photoshoot all by myself.
— 

Jessica Jung in Marie Claire

full interview here