[Picture] Brian Joo and f(x)'s Amber snap a photo!

Brian Joo and f(x)'s Amber took a photo together!

Brian Joo mentioned on his Twitter,"Amber"f(x)" came to watch tonight... I love my supportive sisters in the business^^"

Amber showed Brian's musical Rent some support!

Once again this shows the friendship between the senior and junior!

Credits to Brianjoo's Twitter for the photo!