On November 10, Krystal shared three photos of herself on Instagram.
The photos were of Krystal smiling in front of a snack truck that was sent by Jessica.
Jessica included a panel next to it with photos of the two together and wrote, "To all 'Sweet and Sour' actors/actresses and staff, boost your energy up with this. Giving my complete support to Soo-jung (Krystal's real name). I know you'll do well! From Jessica."

Under this post, Krystal wrote, "I am in such a good mood now. Who has a big sister sweeter than mine?"

Despite being five years apart, they are known to be very close to each other.

(SBS Star)