CLC debuted in 2015 with a five-member lineup of Seunghee, Yujin, Seungyeon, Sorn, and Yeeun.
They released their first EP First Love, including the lead single "Pepe", on March 19.
Their debut showcase was held the day before at the Acts Hotel in Seoul, where they performed their debut song for the first time.
They made their debut music show performance on M Countdown. "
Pepe" is a retro dance number written by Duble Sidekick and Yang Geng.
Part of the song's choreography was choreographed by Rain.

On April 16, CLC released a digital single titled "Eighteen", described as a song about teenage love influenced by 1960s/70s motown and 1980s synthpop.
They began promotions for the single the following day on Music Bank.
Their second EP Question was released on May 28.
Its lead single "Curious (Like)".
On October 10–11, CLC held their first overseas promotional tour in Malaysia entitled "First Love Promo Tour in Malaysia".
For the tour, Universal Music Malaysia released an "Asia Special Edition" version of Question.
The special version included tracks from First Love and Question, as well as the digital single "Eighteen".
CLC debuted in 2015 with a five-member lineup of Seunghee, Yujin, Seungyeon, Sorn, and Yeeun. They released their first EP First Love, including the lead single "Pepe", on March 19. Their debut showcase was held the day before at the Acts Hotel in Seoul, where they performed their debut song for the first time. They made their debut music show performance on M Countdown. "Pepe" is a retro dance number written by Duble Sidekick and Yang Geng. Part of the song's choreography was choreographed by Rain.
On April 16, CLC released a digital single titled "Eighteen", described as a song about teenage love influenced by 1960s/70s motown and 1980s synthpop. They began promotions for the single the following day on Music Bank. Their second EP Question was released on May 28. Its lead single "Curious (Like)". On October 10–11, CLC held their first overseas promotional tour in Malaysia entitled "First Love Promo Tour in Malaysia". For the tour, Universal Music Malaysia released an "Asia Special Edition" version of Question. The special version included tracks from First Love and Question, as well as the digital single "Eighteen".
CLC (group)