"Irony" is a song recorded by the South Korean girl group Wonder Girls, written and produced by Park Jin-young. It was released as their debut single and the lead single from their debut album The Wonder Years on February 13, 2007, through JYP Entertainment. It was also released as a maxi single and extended play (EP), titled The Wonder Begins. Three tracks, including "Bad Boy", "It's Not Love", and a remix version of "Irony", were on the EP. "Bad Boy" was released as the second single in March 2007 while "It's Not Love" was released as the third single on April 27, 2007. "Irony" became one of their biggest hits in South Korea. An accompanying music video was also released and shows Sohee, Yeeun, Sunmi and Hyuna's revenge on Sunye's unfaithful boyfriend by using a voodoo doll to embarrass him.

Popular music critics of Korean web magazine IZM, Jeong Seong-Ha (Hangul: 정성하), Han Dong-Yoon (Hangul: 한동윤), Yoon Jee-Hoon (Hangul: 윤지훈), said the routine of producer Jin-young's African American music style, and the tasteless song about "Irony" in common. In spite of pointing out like this, the song had a moderate chart performance.

A music video was produced for "Irony" to promote the song. Wonder Girls showed the first live performance of "Irony" at the MBC TV series Music Core on February 10, 2007.

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