Can't deny the fact that Heechul and Sulli really look like siblings when they are together playing as if there's no sunbae/hoobae barrier.

In his latest instagram videos, Super Junior Heechul and f(x) Sulli are playing among themselves while enjoying their swing rides.Their big smiles and loud laughters are enough to prove that they are really close to each other.

Heechul captioned, "Have a fun Chuseok (laughing sound. Sulli)" and "Wacky brother and sister".

Check below: