Cute, Mijung addresses her younger friend Ingee as "unni".
And In Gee responds in the comments with 'Unni Unni Unni Unni Unni'. LOL. Of course, In Gee is correct and MJ is just having fun, you only use 'unni' to refer to an older woman (it means older sister).
I just stumbled over this from the 2018 Japan Women's Open...HF posted pics of Chun and Matsuda in that thread, but he couldn't post the video...well, the video is in this article...Dumbo is just an overgrown kid, but we don't care: