열기 (9) / (Hot Air Balloon/Heat) is the fourth track from the mini-album + + by LOONA. It was later included in the repackage album X X as the nineth track.


‘열기 (9)’, is a track that proves a point that even without aggressive tempo, the temperature of the music can become heated up by the fervor of the girls.


 HeeJin   HyunJin   HaSeul   YeoJin   ViVi   Kim Lip   JinSoul   Choerry   Yves   Chuu   Go Won   Olivia Hye 


  • The Korean title, "Yeolgi (9)", directly translates to "Heat (9)".
  • If both parts of the title are pronounced, "Yeolgi (Gu)", it translates to "Hot Air Balloon"
    • "Hot Air Balloon" - the song is about flying higher up with someone.
    • "Bung bung" is an onomatopoeia for the sound a hot air balloon makes.
    • 콜록콜록 (kollok kollok) is an onomatopoeia for the sound coughing makes (for ex, coughs when you have a cold). Coughs can be heard in the song after that line.
  • Brooke Toia also participated in the production of "new".
  • Daniel Caesar and Ludwig Lindell also participated in the production of "new" and "Singing in the Rain".
  • The song was originally titled "Weekend".
  • The original publishers were The Kennel AB and Eccentric Music AS.
  • The sub-publisher was Universal Music Publishing Korea.



Song CreditsEdit

  • Vocals Directed by: G-high (MonoTree)
  • Digital Editing by: Chang Woo Young
  • Recorded by: Min Seong Soo @doobdoob Studio, G-high @MonoTree Studio
  • Mixed by: Hwang Hyun @MonoTree Studio



v - e
HeeJinHyunJinHaSeulYeoJinViViKim LipJinSoulChoerryYvesChuuGo WonOlivia Hye
Solo singles
Mini albums
Repackage albums
Digital singles The Carol 2.0favOriTe
Exclusive releases Orbit 1.0
Concerts LOOΠΔbirth (2018) • LOOΠΔ Concert [LOOΠΔVERSE] (2019)
Other LOOΠΔ x Study Group (2018) • LOOΠΔ Cinema Theory: Up & Line (2018) • LOOΠΔ Premier Greeting: Line & Up (2018) • LOOΠΔ Studio (2018)
Dramas WoomannaDating Class
Shows Insane Quiz Show Season 2The GashinasShows Appearances : InterviewsLivestreamsRadio Shows
Others LOONA TVMiscellaneous VideosMusic VideosTeasers
Characters HeeJinHyunJinHaSeulYeoJinViViKim LipJinSoulChoerryYvesChuuGo WonOlivia Hye
Analysis ViViDAround YouLet Me InI'll Be ThereThe CarolKiss LaterEveryday I Love YouEveryday I Need YouEclipseSinging in the RainLove Cherry MotionnewHeart AttackOne & OnlyEgoistfavOriTefavOriTeHi HighButterfly
Other Lore TBA
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