Following their first performance at the Samseong-dong Fashion Center on September 2, the music video was screened and released online the next day. The group's first broadcast performance of "La Cha Ta" was held at MBC's music show Show! Music Core on September 5. On October 7, the group also released the electro-pop version of the digital single, "Chocolate Love", alongside their label mate Girls' Generation. The single was released for the promotion of the 4th edition Blacklabel series of LG CYON phone, LG Chocolate (BL40. It was announced by SM Entertainment that Amber returned from USA after a long leave since June 2010 and that f(x) are planning to release a studio album in the first half of the year. The first teaser photo for their full-length album entitled Pinocchio was released on April 7, 2011 at the f(x) official website. The MV teaser for the lead single, "Pinocchio (Danger)", was released on April 15, 2011. The album was released on April 20, 2011 and the group held their first comeback stage through KBS’s Music Bank on April 22, 2011. The group have achieved 8-wins from the music shows, namely M! Countdown, Music Bank and Inkigayo. On June 8th, it was announced that f(x) will be releasing their repackaged album of Pinocchio, titled "Hot Summer", on the 14th. It will include all 10 songs from their first album and new track "Hot Summer" (written by Thomas Troelsen and Remee), their OST song for "Paradise Ranch" and digital singles "Chu" and "La Cha Ta."
f(x) "Hot Summer" Song
f(x) with their red costume in their video clip in "Hot Summer"
f(x) choreography concept in their video clip
f(x) and their cool costume concept
f(x) cool pose