Why.. is the first EP by BOYNEXTDOOR, it was released on September 4, 2023. The songs written for the EP explore the themes of "experiencing a breakup for the first time" and "fresh excitement of boys who fell in love with their first love". The album encompasses Dance, hip-hop, pop, teen pop, rock, and ballad.

Tracklist:

1. But I Like You (돌아버리겠다)
2. One and Only
3. Serenade
4. Crying
5. But Sometimes (뭣 같아)
6. ABCDLOVE

Inclusions:

• Out Box : 220 x 160 x 27mm
• CD
• Photobook : 120p
• Postcard : Random 1 out of 6
• Folded Poster
• Photocard : Random 2 out of 12
• Unit Photocard : Random 1 out of 9
• Film Photo
• Letter Sticker