It signifies CLC's music transformation as a complete 7-member group, with former Produce 101 contestant, Kwon Eun-bin, finally joining them with promotions.

[5][6][7][8] On May 23, Cube Entertainment began uploading group and individual photo teasers for CLC's fourth mini-album Nu.Clear that was scheduled to be released on May 30.

Seunghee with green apple, Yujin with strawberry, Seungyeon with orange, Sorn with watermelon, Yeeun with tomato, Elkie with cherry and lastly, Eunbin with lemon character.

[15] "No Oh Oh" is a dance number made of simple minor codes and sounds full of twists with a strongly addictive rich-sound chorus.

"It's Too Late" is a ballad song, with the elements of rock music, about the story of a girl who sends a message to her loved one that she no longer cares for him.

[21] On June 17, member Eunbin was unable to attend a fansign event, and announced that she would be temporarily halting group promotions due to health issues.