Hi High

A teaser for the music video of the song was released on August 17, 2018, and showed the members of Loona running towards somewhere.{{Cite news|url=https://www.billboard.com/articles/columns/k-town/8470693/loona-announces-hi-high-teaser-video|title=Loona Announces First Formal Single 'Hi High': Watch a Teaser|date=2018-08-17|work=Billboard|access-date=2018-11-26}}{{Cite news|url=http://tenasia.hankyung.com/archives/1550036|script-title=ko:이달의 소녀, 완전체 데뷔곡 '하이 하이' 티저 공개…'소녀들의 에너지'|author=우빈|date=2018-08-17|work=TenAsia (텐아시아)|access-date=2018-12-02|language=ko-KR}} Various teaser images were also revealed in the lead up to the album's release. On August 20, "Hi High" was released alongside the album [+ +] as its title track.

The lyrics were written by Jaden Jeong, MonoTree's GDLO, and MonoTree's Hwang Hyun. The music was composed by Mayu Wakisaka, MonoTree's GDLO, and MonoTree's Hwang Hyun.{{Cite web|url=https://www.melon.com/song/detail.htm?songId=31254635|title=곡 정보 - Hi High|website=Melon|language=ko|access-date=2018-11-26}} According to Loona, "Hi High" has the double meaning of saying hi to the now-complete lineup of the 12 members in addition to representing Loona's goal of climbing to the top of the music scene.{{Cite news|url=https://en.yna.co.kr/view/AEN20180820010100315|title=K-pop girl band Loona launches official debut album with full lineup|last=박 |first=보람|date=2018-08-20|work=Yonhap News Agency|access-date=2018-11-26|language=en}} It can also been seen as a reference to the LOONAverse, as all 12 girls, or 3 'worlds' come together. Billboard described "Hi High" as a "bright electro-pop song full of quirky beats and synths" with an "upbeat chorus". Furthermore, Billboard stated that the "track picks up and drops momentum frequently", allowing it to highlight the different singing styles of each member of Loona.

The Kpop Herald also commented on how the song "delivers the bubbly energy of the band", and TenAsia similarly characterized the song as energetic.{{Cite news|url=http://tenasia.hankyung.com/archives/1557629|script-title=ko:걸그룹 이달의 소녀, 방탄소년단 이어 美 빌보드 월드 앨범 차트 4위 랭크|author=우빈|date=2018-08-29|work=TenAsia (텐아시아)|access-date=2018-12-02|language=ko-KR}} Hong Dam-young's album review in The Korea Herald remarked that "Hi High" is fast-paced with a "vivacious tempo and explosive vocals."{{Cite news|url=http://www.koreaherald.com/view.php?ud=20180822000584|title=[Album review] Loona's debut EP was worth the wait|last=Hong|first=Dam-young|work=The Korea Herald|date=2018-08-22|access-date=2018-11-26|language=en}} However, Hong criticized the writing of the song's lyrics as a "major drawback" due to some of its "silly lines".

In 2022 NME crowned the song as the best in Loona's discography calling it a "flawless, impeccable debut single". They added how "perfecting the art of that effervescent, high-octane pop sound, the girls race through the entire song at breakneck speed, leaving not even the slightest room for dullness" in the song. They called the song bubbly, cute, and sprinkled throughout with "lowkey hilarious (but genius) lyrics". They ended their review by commenting how "Hi High" is simply the kind of song that leaves you giddy with happiness every single time.{{cite web|url=https://www.nme.com/features/music-features/loona-every-song-ranked-best-top-3263874|title=Every LOONA song ranked in order of greatness|last=Daly|first=Rhian|date=July 7, 2022|access-date=July 7, 2022|website=NME}}

"Hi High" peaked at number 11 on the US World Digital Songs Sales, marking their second consecutive entry on the chart as a full group.{{Cite web|url=https://www.billboard.com/articles/columns/k-town/8500816/loona-doubles-best-us-sales-week-xx|title=LOONA Doubles Their Best U.S. Sales Week With Second Album Release|website=Billboard|access-date=2019-03-05}}

The song's release on August 20, 2018, was accompanied by a music video that was directed by the production company Digipedi, which also worked on many of Loona's previous music videos, including for "Favorite". The video is colorful and depicts the members of Loona each dressed in a schoolgirl style, dancing and running. At the end of the video, Loona member HeeJin jumps upward toward the sky, portraying a sense of positivity and enthusiasm.{{Cite news|url=http://kpopherald.koreaherald.com/view.php?ud=201808281739202914854_2|title=Loona emerges as a promising girl band|last=Yim|first=Hyun-su|date=2018-08-28|work=The Kpop Herald|access-date=2018-11-26}} The video also features the members wearing denim as they perform a routine in an industrial yard, while other scenes see the girls running through meadows, on swings, and jumping off roofs.{{Cite web|url= https://metro.co.uk/2018/08/20/loona-make-debut-as-full-12-piece-girl-group-as-they-drop-mv-for-hi-high-7859995/amp/|title= LOONA make debut as full 12-piece girl group as they drop MV for Hi High |last=Kelly|first=Emma|date=August 20, 2018|website=Metro|access-date=August 31, 2021}}

The music video reached three million views in three days after its debut,{{Cite news|url=http://tenasia.hankyung.com/archives/1554283|script-title=ko:이달의 소녀, '하이 하이' M/V 300만 돌파…"매일이 기록"|author=김수경|date=2018-08-24|work=TenAsia (텐아시아)|access-date=2018-12-02|language=ko-KR}} and it later surpassed ten million views eight days after its debut.{{Cite news|url=http://tenasia.hankyung.com/archives/1556459|script-title=ko:이달의 소녀, 유튜브 통합 조회수 1억 돌파|author=편집국|date=2018-08-28|work=TenAsia (텐아시아)|access-date=2018-12-02|language=ko-KR}}

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Category:2018 singles

Category:2018 songs

Category:Loona (group) songs

Category:Blockberry Creative singles