Girl group SNSD member Jessica (23) is showing much love to her sister Krystal (18) from another girl group f(x).

A fan took the above photo from the 2011 KBS Korean Music Festival. It shows all the singers up on the stage after the festival was over.

Krystal seemed to be speaking with singer IU when SNSD was passing by. At the moment Jessica came over to Krystal, squeezing her little sister's cheeks then moved on to giving her a big kiss on her cheeks. They were standing hand in hand, showing sisterly love.

Online viewers replied, "I'm envious of Jessica," "Jessica really loves her sister," and so on.