This is an advertisement for an American hair care product, and Yoon Chae is also referred to as "Maknae" in the introduction.

It's already well known that the word "maknae" (youngest child) has become a proper noun among overseas fans...

It's kind of strange that it appears like this even in official advertisements, right? Haha

Anyway, it's really the youngest member of the team, Yoon Chae....ㅎㅎㅎ