- The difference between the physical albums was their CD colors, the cover images, and the photo cards that can be received at random when purchasing the CDs. All other contents of the albums are identical.
- There can be a max of two different photo cards found in the album 'HaSeul' that feature HaSeul solo, and a max of two different photo cards found in the album 'LOONA & HaSeul' that feature HaSeul alongside HyunJin and HeeJin.
- Executive Producer: John Yi
- Creative Director: Jaden Jeong
- Music Producer: MonoTree, Artronic Waves, Jaden Jeong
- A&R: Yoon Do Yeon, Ryu Ji In @ BlockBerryCreative
- Recording Engineer: Iggy, C-no @ OREO Studio, G-high @ MonoTree Studio
- Mixing Engineer: Jeong Jin @ J's Atelier; Alan Foster @ LAFX Studio
- Mastering Engineer: Kwon Nam Woo @ JFS Mastering Studio
- Management Director: Kim Yeong Do
- Management: Yoon In Ro, Lee Geun Mook, Seo Won Bae, Park Yong Tae, Song Yuri
- Administration: Jae Kang, Park Sang Ho
- Press Publicist: HNS HQ
- Styling Director: Kim Min
- Hair Director: Lee Young Ran @ RUE710
- Makeup Director: Jang Yoo Jin @ RUE710
- Music Video: @ Digipedi
- Photographer: Go Ji Yeong
- Art Work: Studio XXX
- 몹 Naver: Behind The Scenes article (Korean)
- YouTube: 이달의 소녀/하슬 (LOONA/HaSeul) "Iceland" TEASER
- YouTube: 이달의 소녀(LOONA) "London" TEASER
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