CLC's third EP Refresh and its lead single "High Heels" were released on February 29, 2016.
This marked the addition of two new members: Elkie Chong and Kwon Eunbin.
Eunbin was a participant on Mnet's girl group survival show Produce 101 at the time.
Cube Entertainment stated that Eunbin had been part of the group's original lineup, but was dropped following delays in production of the group's debut album.
Due to Produce 101 contractual restrictions, Eunbin was not able to promote the single "High Heels" on music shows or other broadcasts, nor appear in the single's music video.
The agency planned for Eunbin to join promotions in the event that she was eliminated from the show, or else to postpone her activities as part of the group until after Produce 101 promotions if she was a winner.
On February 29, a short version of the "High Heels" music video that included Elkie but omitted Eunbin was released.
The full version of the music video, including Eunbin, was released on March 21.

CLC made their Japanese debut on April 13 with the release of their first Japanese EP, High Heels.
The album includes the Japanese version of "Pepe", "First Love", "Like", "High Heels", and a cover of Kylie Minogue's "I Should Be So Lucky".

On May 12, CLC launched their official Naver V App channel, followed by a broadcast of Eunbin's first live appearance with the group.
The group released their fourth Korean EP Nu.
Clear on May 30, with the title track "No Oh Oh" written by Shinsadong Tiger.
CLC carried out album promotions as a seven-member group in June.
On July 27, CLC released their second Japanese EP, Chamisma.
The EP peaked at #9 on the Oricon Daily Albums Chart, making it their first release to enter the Top 10 of the Oricon chart.
CLC's third EP Refresh and its lead single "High Heels" were released on February 29, 2016. This marked the addition of two new members: Elkie Chong and Kwon Eunbin. Eunbin was a participant on Mnet's girl group survival show Produce 101 at the time. Cube Entertainment stated that Eunbin had been part of the group's original lineup, but was dropped following delays in production of the group's debut album. Due to Produce 101 contractual restrictions, Eunbin was not able to promote the single "High Heels" on music shows or other broadcasts, nor appear in the single's music video. The agency planned for Eunbin to join promotions in the event that she was eliminated from the show, or else to postpone her activities as part of the group until after Produce 101 promotions if she was a winner. On February 29, a short version of the "High Heels" music video that included Elkie but omitted Eunbin was released. The full version of the music video, including Eunbin, was released on March 21.
CLC made their Japanese debut on April 13 with the release of their first Japanese EP, High Heels. The album includes the Japanese version of "Pepe", "First Love", "Like", "High Heels", and a cover of Kylie Minogue's "I Should Be So Lucky".
On May 12, CLC launched their official Naver V App channel, followed by a broadcast of Eunbin's first live appearance with the group. The group released their fourth Korean EP Nu.Clear on May 30, with the title track "No Oh Oh" written by Shinsadong Tiger. CLC carried out album promotions as a seven-member group in June. On July 27, CLC released their second Japanese EP, Chamisma. The EP peaked at #9 on the Oricon Daily Albums Chart, making it their first release to enter the Top 10 of the Oricon chart.
CLC (group)