The single "Nu ABO" peaked number one on Gaon Chart.

In 2011, the group released their first studio album Pinocchio, which was later re-released as Hot Summer in the same year.

The album spawned two more singles: "Pinocchio (Danger)" and "Hot Summer" reached number one and two on Gaon Chart.

[2] Their second EP Electric Shock (2012) and second studio album Pink Tape (2013) reached number one.

[5] f(x) debuted in Japan with released the Japanese versions of their singles "Hot Summer".