the title is a pun on ano's name, "ano" (あの) can also be read as "that" so the title would be あの笑み = Ano Emi = that smile
they announced the collab a while ago, this is ano's first collab after becoming a solo singer
"ano" and "AAAMYYY" announce collab single "Ano's smile" - K-Pop Source — Keeping the K-Pop Forum Spirit Alive
the title can also be read as "That smile" (Ano means "that" in Japanase) this is ano's first collab since becoming a solo singer, the song is going to be included in AAAMYYY's new album "ECHO CHAMBER" which goes out on sale next month! back in April ano released her debut single "AIDA" and...
kpopsource.com