Sunny greets YoonA a Happy Birthday

It's Sunny's turn to greet her 'Sugar Sister' a happy birthday!

That's YoonA, and here are their photos where Sunny expressed, "My dongsaeng who I love #HappyBirthdayYoona I love you, goddess-nim💕 #ItsSunYoongSunYoong"~

It was YoonA who made the term 'Sugar Sisters' because Sunny and YoonA performed Maroon 5's 'Sugar' at their Phantasia concerts.

Sunny's Instagram