Jessica sat down before her fans through the Naver 'V' app on May 16 to promote her solo album, 'With Love, J'!

On this day, she called her sister, Krystal, who was in her phone under the name 'Pretty Soo Jung.'  Their sisterly love can't get any cuter.

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Krystal cutely greeted the viewers with, "Our unnie's solo is coming out."  Jessica instructed her then with, "You have to add, 'Please listen to it a lot, congratulations,'" making the atmosphere even more warm and fuzzy with the lighthearted jesting.

Krystal said, "I really like the song 'Love Me the Same' as much as the title song 'Fly.'  They give off my sister's vibe."

Maybe in the future Krystal can feature on her sister's track!