It might seem like deja vu, but no, Jessica talked about Krystal yet again not with an interview with Tenasia but while she was on 'Park Myung Soo's Radio Show' on May 19! They are one of the most well-known sibling pairs in the Korean entertainment industry, so it's not too surprising.
She said regarding her sister, "My younger sister gives me a lot of strength. Because we do the same work, we can talk about a lot of things. Seeing as how she's my family, we can talk to each other without reservations, which is nice. Krystal is stronger than I am. I can't do anything when it comes to strength [with her]. She subdues me."
Park Myung Soo also commented on how the 'Ice Princess' seems to have become brighter. He asked, "When were you the happiest lately?" and she replied, "When I got first place on a music chart. My sister called me and cried. She was so happy."