On February 7, 2017, A100 Entertainment announced that they would be doing their first girl group project via their YouTube channel and started uploading covers of the group.
There was a various number of members throughout the project that were always masked and kept their identities a secret while they did the covers.
The number of members changed until only five members remained and they formed the final line-up.
On October 2, A100 announced that their girl group will be named NeonPunch and introduced the members through a teaser for their pre-debut reality show.
The members were Dayeon, Hajeong, Baekah, Arang, and Iaan.
NeonPunch auditioned for JTBC's reality show, Mix Nine, but only Baekah passed the audition stage and made it onto the show.

On April 13, 2018, A100 announced that NeonPunch would be the new model for Beauty brand DPC.
The members of the group were Baekah, Dayeon, and Iaan with new members May and Terry.
The group was stated to debut at the end of May. On May 8, A100 announced that the debut was postponed to June, and the five members Baekah, Dayeon, Iaan, May and Terry were confirmed as the final members of NeonPunch.

On June 27, 2018, NeonPunch released their first single album, Moonlight, along with the eponymous lead single.
On June 30, they made their official debut stage on the music program MBC's Show!
Music Core.
On October 4, A100 announced that Terry had taken a break for personal reasons and had not explained anything further.
On February 7, 2017, A100 Entertainment announced that they would be doing their first girl group project via their YouTube channel and started uploading covers of the group. There was a various number of members throughout the project that were always masked and kept their identities a secret while they did the covers. The number of members changed until only five members remained and they formed the final line-up. On October 2, A100 announced that their girl group will be named NeonPunch and introduced the members through a teaser for their pre-debut reality show. The members were Dayeon, Hajeong, Baekah, Arang, and Iaan. NeonPunch auditioned for JTBC's reality show, Mix Nine, but only Baekah passed the audition stage and made it onto the show.
On April 13, 2018, A100 announced that NeonPunch would be the new model for Beauty brand DPC. The members of the group were Baekah, Dayeon, and Iaan with new members May and Terry. The group was stated to debut at the end of May. On May 8, A100 announced that the debut was postponed to June, and the five members Baekah, Dayeon, Iaan, May and Terry were confirmed as the final members of NeonPunch.
On June 27, 2018, NeonPunch released their first single album, Moonlight, along with the eponymous lead single. On June 30, they made their official debut stage on the music program MBC's Show! Music Core. On October 4, A100 announced that Terry had taken a break for personal reasons and had not explained anything further.
NeonPunch