In her 171217 instagram update, Sana mentioned Soyou: "Soyou sunbaenim also worked hard today and I love you... ><❤️"
(Soyou is an ex member of SISTAR and she's currently working as a solo artist)

In reply, Soyou posted on her instagram story: "Sana sshi, me too... 😘"

This is such a cute interaction! Thank you sunbaenim for supporting our girl! It's great to see Sana getting along with everyone~ 💕