B1A4 (비원에이포) KOREAN B1A4 – Only One “Only One” Let’s Fly 2011.04.21 Jinyoung, CNU, Sandeul, Baro , Gongchan Lyrics/작사: Hwang Sung Jin Composer/작곡: Lee Joo Hyung, Lee Sang Ho Arranger/편곡: Lee Joo Hyung