• At the End -Piece of BtoB vol. 1
  
• What's On Your Mind -My Friends Love Life OST

2016

• The Love of Fingertips (with B1A4, Eunkwang, Heo Young-ji, A-JAX, April,   Oh My Girl and Kassy)
  
• After the Play Ends (with Elkie and Heota) -After the Play Ends OST
  
• For You (with Eunkwang, Ilhoon, Minhyuk) -Cinderella and Four Knights OST
  

2015

• You Inside My Memories
  
• Goodbye Sadness (with Eunkwang and Ilhoon) -Sweet, Savage Family OST
  

2013

• Bye Bye Love (with Yoseob, Dongwoon,   Jung Il-hoon) -When A Man Falls in Love OST
  
• Past Days (with Junhyung, Ha Yeon-soo, Minhyuk, Hyunsik, Sungjae) -Monstar OST
  
• After Time Passes (with Junhyung, Minhyuk, Hyunsik, Sungjae) -Monstar OST
  
• First Love (with Junhyung, Minhyuk, Hyunsik, Sungjae) -Monstar OST
  

2012

• Be Alright (with Yoseob, G.NA, Gayoon) -Road to Hope OST