SBS revealed behind-the-scenes pictures and still cuts of Krystal on the set of the upcoming drama 'My Lovely Girl'.

They reveal that the f(x) member will be showing a different image than her usual cute, feisty persona on stage. She softened her look for a more ordinary appearance with dark hair, bangs, and casual attire.  

SEE ALSO: Krystal proves she's a natural beauty with an adorable baby photo on her birthday

Director Park Hyung Ki said, "Maybe it's because of her ambitious personality, but she has more enthusiasm for the production than anybody else. Despite taking on a difficult character, she shows her determination to pull it off through her gaze to the point you can see sincerity in Krystal when she's in front of the camera. I think that's the reason it's impossible not to get immersed in her at first sight."

The drama premieres on September 17.