One of the greatest strength of SNSD is their close relationship among each other which they caring to each other just like real sisters. SONEs have seen it numerous time through different videos & sources.
Today, i would like to show you another example which Sunny & TIffany showing their playful & real sister like relationship on the stage^__^










videos credit to sosion09, 
Posted by SNSDlife@snsd-life.blogspot.com