유난히 더웠던 지난여름, 우린 참 행복했었나 봐 [Credit] IRO Double Single [In That Summer] 1. In that Summer (Feat. 슬안, 엘도) Prod. IRO Lyrics by IRO, 엘도 Composed by IRO, 엘도 Arranged by IRO Mixed by Lebi (레비), YungKowser @YungKowserProduction 2. In that Summer (Inst.) Prod. IRO Composed by IRO Arranged by IRO Mixed by YungKowser @YungKowserProduction All track Mastered by YungKowser @YungKowserProduction Creative Director by IRO, Aidar Mun (문시우)