Prior to their official debut, rookie girl group ANS has revealed a sixth hidden member!

Following the group's teaser images, on August 14, ANSE uploaded a teaser video for the girls' pre-debut single titled "Wonderland" through their official YouTube channel. The clip lasts for about 50 seconds and features all the five members. The MV teaser gives off a summer vibe as the ladies enjoy the fresh sea breeze and have fun under the sun. They can be seen hanging out in the pool, aboard a yacht while appreciating the stunning views surrounding them, and dipping their feet in the water while on the shore - a perfect summer getaway.

On August 15 at 6 p.m. KST, the official music video for "Wonderland" has been released. The MV, as of August 27, already has more than 70,000 views and has been earning positive comments from the public.

However, the known to be five-member group will become a six-member group, as ANS has unexpectedly unveiled the hidden member, Raon. On August 23, through their Instagram account, a photo of the five members together with an unknown person was uploaded. The person is standing in the middle and facing back at the camera while the other members are smiling and pointing at the new girl. This picture made the netizens curious as to who might be the person ANS is with.

On August 26, a new set of profile photos were uploaded with one of the captions reads, Raon. It turns out the unknown girl in the previous photo is the hidden member of ANS, whose name is Raon. Born in 2001, Raon is a 20-year old artist who has experience in being part of a dance team and a school band. She is believed to be the vocalist of ANS.

Furthermore, a new group photo was revealed, this time it features all the six members. In the image, the girls appear to have dinner outside and just enjoying themselves. Wearing summer outfits, the members seem to be on a holiday vacation. This teaser is possibly ANS's concept for their official debut.

Meanwhile, ANS will be making its official debut this September. They are the first girl group signed under ANS Entertainment.