On July 20, Krystal shared the photo below on Instagram with the message, "We didn't even do 1 thing wrong." In the image, the f(x) member smiles as she sips on coffee in front of cart and banner that says, "We didn't even do 1 thing wrong. Our only fault is being too pretty. Please take care of our pretty, Soojung. From Shin Hye unni who loves Soojung the most."
Park Shin Hye and Krystal were co-stars in the 2013 drama 'The Heirs' and have stayed friends ever since, and Krystal is currently playing the role of Moora in the tvN drama 'The Bride of Habaek'.