Did you know that there is an original song of f(x)'s 'Hot Summer'?

Did you know that f(x)'s original song 'Hot Summer' was released in 2011?

I was listening to f(x)'s Hot Summer and I was like, why is this song so catchy? Then I found out that a German 3-member girl group called 'Monrose' released a song with the same name in 2007.

The original song also had the power to reach number 1 on the single charts in Austria, Germany, and Switzerland.