f(x)'s Krystal and MC Lee Jong Suk, the "High Kick" siblings, reunite on "Inkigayo."

On SBS "Inkigayo," which aired on June 17, the MC's held a short interview with f(x) before their comeback stage.

f(x)'s Krystal and MC Lee Jong Suk had previously met through the MBC sitcom "High Kick", where they played the role of siblings. Krystal, to Lee Jong Suk, said, "How did 'stupid' become Inkigayo's MC?", and Lee Jong Suk replied back as if he was still playing the role from 'High Kick'. They also greeted each other with their popular phrase, 'bbooing bbooing' from the sitcom.