"Lies" (Hangul: 거짓말; RR: Geojitmal) is a song performed by the South Korean boy band Big Bang. The song was written and composed by rapper G-Dragon. It was released on August 16, 2007 by YG Entertainment as the first single from Big Bang's first extended play Always (2007). It became the group's breakout hit, topping several charts in their home country. The song remains one of their most critically acclaimed song to date and is often view as one of their signature songs.

Big Bang's first extended play, Always (2007), marked several changes for the group. Though the members had previously involved themselves with writing and composing, the group took more creative control over their music, moving away from their hip-hop roots and towards electronic dance music. G-Dragon composed and wrote most of the tracks included in their first EP, including "Lies." The rapper originally wrote this track for his solo album, but the company decided it would suit the group better. Released as the lead single, it became their first number one hit, topping the Melon Chart's Top 100 for over 54 weeks, the first song to spend over 50 weeks on chart, including 22 weeks on Top 10. It also topped Cyworld charts for two months in a row, eventually becoming their break-out hit and consequently winning Song of the Year at the 2007 Mnet Asian Music Awards.

Receptions were positive for "Lies," which critics described as "through the roof."Billboard stated that "Lies" placed Big Bang "down the path into the realm of avant-garde experimentalism that they’ve become known for over the past few years" and called one of South Korea's "most memorable songs."Sun-Times stated that even though their sound has evolved, "their core blend of emotion and swagger shines through on this song." The impact of the song was described by Kang Myung Suk - a music critic and former editor-in-chief of 10Asia magazine. Suk wrote "in that time, the one song ‘Lies’ satisfied all the music consumers in Korea. The ‘sound’ of this song was better than the normal kpop, and the melody development was easy for anyone to enjoy. Before ‘Lies’ came out, the music charts were dominated by medium tempo ballad songs." The composition was also praised, noting that "G-Dragon made this song with memorable rap and melody pieces" and admired the song for having "no useless parts". The critic concluded "‘Lies’ has the generation’s code who wants to be a step forward in the trend but comfortable at the same time, and that wants to stand out but also somewhat mix in at the same time. This was a market that not exist before Bigbang’s ‘Lies, and this was the moment where the idols met this generation’s emotions."

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