‘Model Idol group’, Nine Muses, is drawing new attention from female fans after revealing their secret to maintaining their slim and trim figure. On March 8th, the girls shared the photo above via their official me2day page revealing their ‘paper cup’ diet, as well as their own stretching techniques to acquire a slim waist line. The photos showed Sera and Hyemi, who have been on this ‘paper cup’ diet for the past five months, walking viewers through the process. Read more on Allkpop.