[2] On June 24, a teaser video titled "A Midsummer Night's Phantom" was released.

[7] On July 9, the music video teaser for "Party O'Clock" was released.

[8] The single album was released alongside the music video for "Party O'Clock" on July 11.

The first track and lead single "Party O'Clock" was described as "garage-based" pop song characterized by "bright and exciting melody" with lyrics about "solving the mysterious things that happen in the forest on a midsummer night".

[10] "Roller Coaster" described as an urban house song with "dreamy pre-chorus".