I have made this post because I don't really know how to fix this
Ningning is younger than Karina so Karina is an unnie to Ningning
What you highlighted is Karina's first impression of Ningning when she first met her. Ningning is younger than Karina, but Karina thought she was older. I hope this makes sense.
Sorry I was mistaken, I thought that was the impression of the other members. I am sorry
What do you think?