• Tell Me - Piece of BtoB vol. 6
• Ambiguous (with Eunkwang & Hyunsik) -Fight for My Way OST
  

2016

• Young Love (with Joy) -We Got Married
  
• Playing With Fire (with NC.A) 
  
• On The Four Lane Road                           -by Geeks's Louie 
  

2015

• That Day Long Ago                                      -King of Masked Singer Special
  
• Ojingeo Doenjang (with N, Jackson and Hyukas Big Byung) 
  
• Photograph (with Namjoo) -A CUBE         - For Season Blue Season 2
  
• Love Song (ft. Park Hye-soo)                      -Who Are You: School 2015 OST
  
• Loving You Again                                         -Scholar Who Walks The Night OST
  

2014

• Stress Come On (with N, Jackson and Hyuk as Big Byung) 
  
• Curious (궁금해) (with Oh Seung-hee) -Plus Nine Boys OST
  

2013

• Past Days (with Junhyung,                         Ha Yeon-soo,Minhyuk, Changsub & Hyunsik) -Monstar OST
  
• After Time Passes (with Junhyung, Minhyuk,Changsub & Hyunsik)                   -Monstar OST
  
• First Love (with Junhyung, Minhyuk, Changsub & Hyunsik) -Monstar OST