On August 23, the singer released his OST "Tell Me", which is about a woman who kept chasing after one sided love, but now is learning to love herself. The cute lyrics aim to express her efforts to show others how she comes to love herself. Sandeul's OST also shows support for fellow B1A4 member Baro, who plays Seok Taek. 

'Manhole' airs every Wednesday and Thursday on KBS2 at 10 PM KST. Listen to Sandeul's OST above and check out his making film below!

SEE ALSO: B1A4 celebrates 13th anniversary with sold-out fan concert series