Pinocchio is the debut studio album by South Korean girl group f(x), released on April 20, 2011 by SM Entertainment.

"Pinocchio (Danger)" was released as the album's title track on April 17 as a digital single.

Following their first live performance at the Samseong-dong Fashion Center on September 2, 2009, the music video was screened and released online the next day.

The music video for the song, released on September 2, 2009, featured the group members dancing on various theater-themed sets.

They start by arriving and getting off a pink car and dancing in front of a lighted theater entrance during the night.

Amber, dressed as a ringmaster is on a dark stage with fire pits in front, red carpet beneath and huge hanging doors as decors at the back.

Krystal, dressed in formal black, is in a room with many hanging crystals and mirrors at the back.

"Gangsta Boy", an album track, marked the first time the Danish music producers and songwriters Thomas Troelsen and Mikkel Remee Sigvardt collaborated with f(x).

"Hot Summer" is a Korean cover of the song of the same title, originally recorded by the German band Monrose.

[2] F(x) had their first live televised performance after a year-long hiatus through KBS's Music Bank on April 22, 2011.

The music video for "Hot Summer" was released on June 17 through SM Entertainment's official YouTube account.

[7] The repackage Hot Summer debuted and peaked at number 2 on the Gaon Album Chart for the week ending June 18, 2011, becoming the group's third Top 5.