"Heartbreaker" is the lead single from Big Bang leader G-Dragon's first solo album of the Heartbreaker album, Released August 19, 2009 it topped many charts upon release,and went to sell over 3 million digital downloads in 2009 alone. including reaching the number-one spot on the Mnet, Melon, and KBS Music Chart. His first solo album, "Heartbreaker" sold the most albums in Korea in 2009. The official remix features American rapper Flo Rida. By the end of 2011, "Heartbreaker" was downloaded exactly 4,407,355 times.
The music video opens with G-Dragon in a lit up room a wearing black outfit, gloves and shades. It then transitions to him wearing a silver and black outfit with a heart around his eye. He is in a futuristic styled room, sitting on a couch underneath an apple tree surrounded by many women. As he sings, he drinks a beverage from a can, and is seen with a holographic girl whispering in his ear. When the chorus begins, he is then seen dancing against a white backdrop, accompanied by male backup dancers in masks. When the second verse begins, G-Dragon is seen underneath a sheet eating an apple, where the bite marks are in the shape of a heart. He is also seen dancing against a black backdrop wearing a tuxedo, accompanied by female backup dancers.
When the chorus begins again, he dances in front of the same backdrop wearing a silver vest, accompanied by the same masked male dancers. He is then seen in the same lit up room from the beginning, wearing a red, telephone design printed jacket. As he sings the bridge, he walks down a hall where there are many apples on the walls. As he touches one, he sees a hologram of his "heartbreaker" and tries to reach for her. A brick wall then appears and blocks him from her. While he sings the final lines of the song, he begins punching the wall. When he finally breaks it, he falls to the ground and looks up, only to find himself in the arms of his loved one. The video ends with a teaser of G-Dragon's music video for Breathe.
The music video was a hit on GomTV, where it reportedly gained 5 million viewings in just 18 days. With the success of his video, G-Dragon was awarded the "Artist of the Month" from GomTV.
G-Dragon was accused of plagiarism by Sony Music when "Heartbreaker" was stated to have sound similar to Flo Rida's "Right Round"  EMI, who also has rights to "Right Round" said that they saw no similarities between these two songs. Sony Korea has denied G-Dragon the ability to promote the track any further without paying reparations. On September 21, 2009, Sisa Magazine, a news program on MBC, stated that officials from Sony reportedly sent YG Entertainment warning letters about plagiarism. Sony's legal representative stated, "It was a hard decision for the music critics." However, they decided that there were similarities and accordingly issued a warning letter to the production company and composers. They have also denied YG Entertainment the permission to promote these songs. However, YG Entertainment claims that nothing has been decided or legally determined and that the "letter" which YG received from Sony is not considered legal action; the company has also stated that they have not received a direct response from the American publishers regarding this matter. On March 6, 2010, YG Entertainment announced that they personally contacted Flo Rida's representatives and Flo Rida is going to appear as a featuring artist in a new version of Heartbreaker, to be released as a bonus track on G-Dragon's Live Concert Album.