The girl group guested on the June 28 episode. During the show, MC Defconn mentioned Na-Eun's younger sister and said, "Na-Eun's dongsaeng is pro golfer Son Se Eun. She's doing well nowadays, filming CFs and stuff."
Na-Eun reacted in surprise and asked, "How'd you know?''
Following the broadcast, attention toward Na-Eun's younger sister arose and photos of Son Se Eun started resurfacing.
Netizens expressed amazement at Son Se Eun's gorgeous visuals and commented, "She looks like Krystal...", "Wow she's prettier than Na-Eun", "Dongsaengs really pretty too", "Hul, dongsaeng is prettier."