• Investigation Couple OST Part 1 - "Can't Breathe"
• "Red Carpet" - DWTD 

2017

• "Be My Friend" with I.M (Monsta X) 

2016

• "H.ear Your Colors" (appearing as a vocal) - by Mad Clown
• Slow - by Hyolyn 

2015

• Coach Me - by Hyolyn and San E
• 0 (Young) - by Giriboy, Mad Clown & Jooyoung 
• Intersteller - by Hyungwon, Jooheon & I.M (Monsta X) featuring Yella Diamond 
• Bad X - by J'Kyun and Konsoul 
• Orange Marmalade OST - "Attracted Woman" 
  
• Mask OST Part 7 - "Similar" 
  
• "Get Low" featuring Mad Clown 
  
• "Stay Strong" featuring Flowsik 
  
• "Flower Cafe" featuring I.M (Monsta X) & Sam Ock 
  

2014

• "Ganggab" (깽값) - by Mad Clown