[6] The tracklist was released on September 11, revealing four tracks: lead single "La Di Da", "Untouchable", "Gxxd Boy" and "No Good Reason"; the lyrics for "La Di Da" were co-written by member E:U.

[9] According to Yuehua Entertainment, −77.82X−78.29 represents Everglow's "powerful and intense charisma", as compared to their previous works.

[10] The lead single, "La Di Da", falls in the uptempo electropop and retro categories, and its lyrical content is a "warning" to the "haters who are pretending and full of dissatisfaction in [this] confusing era".

[10] Everglow held a live showcase on September 21, where they performed "La Di Da" and "Untouchable".

[11] The group started promoting "La Di Da" on September 24 at Mnet's M Countdown, followed by performances on KBS' Music Bank, MBC's Show!