On October 12 KST, Luna took to her personal Instagram account to write: "I love you, and many congratulations to our Soojung [Krystal's Korean name] on enterining a new company. 💜🙏 I will always cheer you on while working hard!"
The accompanying picture shows Luna on the set of a profile photo shoot, striking a pose in a white skirt and black t-shirt.
Meanwhile, earlier that day, it was announced that Krystal had left SM Entertainment and was now signed to H& Entertainment, joining other actors such as Jung Ryeo Won, Son Dam Bi, In Kyo Jin, So Yi Hyun, and more.
Check out Luna's Instagram post below!