According to the Vogue Korea interview released today the members participated in the album:

HEESEUNG: I participated in writing and composing the song, but I also put a lot of effort into the album overall.

JAY, JAKE, SUNGHOON, SUNOO, NI-KI: all members participated as lyricists in the song produced by Heeseung hyung!

JUNGWON: I also participated in the composing/writing of the song so please look forward to it!

Translations by namaewariki and enhypenupdates

Original text:

์ด๋ฒˆ ์•จ๋ฒ”์—์„œ ๊ฐ์ž๊ฐ€ ์ฐธ์—ฌํ•œ ์˜์—ญ์ด ์žˆ๋Š”์ง€๋„ ๊ถ๊ธˆํ•˜๋„ค์š”.

ํฌ์Šน ์ž‘์‚ฌ ์ž‘๊ณก์—๋„ ์ฐธ์—ฌํ–ˆ์ง€๋งŒ, ์•จ๋ฒ” ์ „๋ฐ˜์ ์œผ๋กœ ๋…ธ๋ ฅ์„ ๋งŽ์ด ๊ธฐ์šธ์˜€์Šต๋‹ˆ๋‹ค.

์ œ์ด, ์ œ์ดํฌ, ์„ฑํ›ˆ, ์„ ์šฐ, ๋‹ˆํ‚ค ์ด๋ฒˆ์— ๋ฉค๋ฒ„ ์ „์›์ด ํฌ์Šน์ด ํ˜•์ด ํ”„๋กœ๋“€์‹ฑํ•œ ๊ณก์— ์ž‘์‚ฌ๊ฐ€๋กœ ์ฐธ์—ฌํ–ˆ๊ณ ์š”!

์ •์› ์ €๋„ ์ž‘๊ณก์— ์ฐธ์—ฌํ–ˆ์œผ๋‹ˆ ๋งŽ์€ ๊ธฐ๋Œ€ ๋ถ€ํƒ๋“œ๋ ค์š”!

by SaltyPoppy