Chemistry (Trouble Maker EP)

On October 4, 2013, Cube Entertainment revealed that Trouble Maker would be making their comeback. A representative said, "We have established their comeback as Trouble Maker to be made on the October 24 episode of Mnet's 'M! Countdown'. As it has been a while since they were active as a unit, the both of them are fully engaged in practice and very nervous."^[1]

On October 23, a teaser video and photo was released which showcased a sexy concept; the release date was clarified to be October 28, and the lead single would be called "Now" (Korean: 내일은 없어).^[2] On October 26, the official site was launched, showing 12 different teaser photos.^[3][4] The album was released on digital download on October 28, and on physical album on October 31.^[5] A special limited edition (3,000 copies), rated 19+, was released on November 12. Cube said this version shows a "level of allure and sexuality exceeding that of Trouble Maker as everyone knows it now".^[6][7][8]

Trouble Maker began promoting "Now" on October 30 on MBC Music's Show Champion^[9] The song received numerous first place awards in various music show broadcasts, a double crown in Mnet's M! Countdown (November 7, 14)^[10] and in KBS Music Bank (November 8,15),^[11] in MBC Music Core (November 9),^[12] in SBS Inkigayo (November 10)^[13] and a triple crown in MBC Music Show Champion (November 6, 13, 20).^[14]

The music video for "Now", released on October 24,^[15] was directed by Lee Gi-baek who also directed Beast's "Caffeine", "Shadow (Geurimja)" and "I'm Sorry".^{[citation needed]} The choreography was done by Keone Madrid and Mariel Madrid, who have worked with Urban Dance Camp in Germany.^{[16][better source needed]}

The music video has a "Bonnie and Clyde" theme. Jeff Benjamin of Billboard K-Town wrote that the video "feels like a concentrated effort to get Western attention". He also said, "'Now' shows the two K-pop idols engaging in very un-idol-like behavior: smoking cigarettes, drinking beer, there's even an implied threesome with Hyunseung. Still, it's the type of shock tactics that American pop fans have become indifferent to."^[17]

On November 3, 2013, Trouble Maker released an uncut version of the music video, which was twice as long as the original.^[18]

On November 7, 2013, "Now" debuted at number 1 on the Gaon Digital Chart.^[21] The song reached the top of the Billboard K-Pop Hot 100 for the date of November 16, 2013.^[22]

• Hyuna – vocals, rap
• Hyunseung – vocals
• Shinsadong Tiger – producing, songwriting, arranger, music
• Rado – producing, songwriting, arranger, music
• LE – songwriting