The teaser photos just keep rolling in for the Brown Eyed Girl's 4th album! On September 19th, new concept images for members Ga-In and Narsha were revealed through their official Twitter account. The girls' are seen wearing two very different masks for two themes, "RESISTANCE" and "FREEDOM". Narsha looks ethereal with her bejewelled mask, and the soft lighting around the star makes her seem gentle and angelic. Meanwhile, Ga-In looks equal parts tough and intimidating with her spiked headgear. Interestingly enough, it looks like the stylist took a boxer's protective headgear and embellished it with with some serious spikes and chains. On the same day, Ga-In treated her fans with additional teaser photos of herself through her mini homepage. She jokingly wrote,  "Let's fight!" and "I'm afraid of that person too..." Fans were able to catch a better glimpse of her concept style, which appears to be a mix between sporty and luxurious gothic.   Ga In looks fierce as she dons a black outfit and her standard thick eyeliner, which has a metallic shimmer this time around to compliment the bejewelled ribcage design on her top. She also seems to be holding up an unusual gas mask for the camera. Netizens commented, "This looks so awesome!", "This album will be daebak! Why are you so pretty!?", and "You look like a slick terminator.  I can't wait to see your dance choreography!" The Brown Eyed Girl's 4th album will be released on the 23rd through various online sites. Stay tuned to allkpop for more updates! Source + Photos: Star News (1), (2)