Girl group SATURDAY, a "pretty girl next to a pretty girl," boasted of its "pretty beauty" that has been completed since childhood.

Images of the third single "IKYK" (I Know You Know) were released on the SATURDAY's official SNS channel on Sept. 7 and 8.

The released images are of SATURDAY's childhood, with MINSEO and JUYEON, HAMEUL, AYEON and YUKI showing off their small faces and impeccable features. In particular, she is proving herself to be a "mother-beauty" by showing her unparalleled beauty, including acute eye smile and an innocent look with an apple headband.

SATURDAY has also released a wide range of facial expressions and smiles that can't be hidden, revealing a different presence from childhood.

SATURDAY, which is releasing a variety of content, including scheduler and "BByong" concept images and "Back To The Future" images, will capture the public "bold" with its fresh charm and tangled lyrics through the album.

SATURDAY's new song "BByong" will be released on various music sites at 6 p.m. on Wednesday.