On July 13, Krystal uploaded a picture through her personal Instagram account with a heart drawn around a picture of her sister and herself. It appears that Jessica sent Krystal and the staff of the drama a coffee and food truck. The poster within the Instagram post reads, "I'm cheering for my sister SooJung! 'Bride of the Water God'�daebak!"

Previously, Jessica took pictures of her younger sister in the drama and posted on her own SNS pages to promote the drama. Now, she shows further encouragement by sending Krystal food and drink trucks.

A post shared by KRYSTAL (@vousmevoyez) on Jul 13, 2017 at 9:31pm PDT

SEE ALSO: CNBLUE's Minhyuk says Krystal is the prettiest of all the actresses he has worked with