TWICE's Nayeon has released concept photos for her new single "NA-sty." On the 10th, Nayeon unveiled concept photos for the single album, due out on the 20th, through TWICE's official social media channels. In the photos, Nayeon wears a vivid yellow dress with purple hair for a striking complementary-color look. Against a pastoral landscape reminiscent of a default computer wallpaper, she strikes free-spirited poses and plays with digital devices such as laptops and monitors, adding a kitschy touch by appearing as a figure inside a monitor screen. "NA-sty" is her first solo album in about two years and five months, since her second mini album "NA" in June 2024. It contains three songs: the title track "BABY ANGEL," "SHiVER" and "BOY," and Nayeon took part in writing the lyrics and composing "SHiVER." Korean and international writers joined the project, including Shim Eun-ji, who has written lyrics for many TWICE hits, Trey Campbell, JULiA LEWiS and rapper Lil Cherry.