It has been revealed that there is a fourth 'Mask Girl.'

On August 20, a model named Ji Ji Ahn posted on her Instagram revealing that she  had played the body double for Kim Mo Mi in the drama 'Mask Girl.'

She posted a few photos and wrote on her Instagram, "I started dance practicing as the body double for Mo Mi, in January last year. Then finally began filming in August. I experienced so many things for the past year, from passing the audition and crying because I couldn't dance well..."

She continued to write, "At first, when I started memorizing this choreography and practicing, I realized how amazing of a singer Kim Wan Sun (the Korean Madonna) sunbaenim was. That's how extreme, extremely challenging 'Dancing to Rhythm' performance is."

Persevering even during her battle with COVID-19, she trained hard, putting in 2-3 hours during each of her thrice or four times weekly practice sessions. "The dance sequence, if performed in its entirety, ensures you're drenched in sweat. Such was the intensity, I regularly found myself doubled over on the studio floor. Despite these difficulties, it was an experience I wouldn't trade," she recounted.

Ji Ji Ahn then shared, "Thanks to this, I lost 2-4 kg (4.5 - 9 lbs)  and was able to hit a weight of 46-47 kg (101/103 lbs). The fat from my chest and face disappeared, and my face looked like a skull, but now my weight has returned to normal. However, it's not easy for my facial and chest fat to come back. Still, I'm so happy that 'Mask Girl' is airing and becoming a hot topic."

Ji Ji Ahn also expressed gratitude towards the directors, the production team, and the crew, who played essential roles during the choreography scene shoots. She also had a heartfelt mention for Lee Han Byul, the pre-plastic surgery face of Kim Mo Mi, clearly showcasing her enjoyment of this unique journey and the bonds she formed during it.