The vocal duo of global K-Pop group SEVENTEEN has arrived as a new subunit - DxS (DK X SEUNGKWAN) releasing their 1st Mini Album 'Serenade' available in two standard versions: BLUE Ver. & ECHO Ver. Contents: CD, Folder, Book Band, Photo Book (BLUE Ver.: 40pg / ECHO Ver.: 84p), Folded Poster, Sticker, Credit Book, Mini Photobook (BLUE Ver. Only), Bookmark (ECHO Ver. Only - 1 of 2), Photo Card (2 of 6), Lyric Card. US/EU Retail Exclusive: Photo Card (1 of 2). Dimensions: 172 x 220 x 12 mm.