Crush is the singer behind part 3 of the 'It's Okay That's Love' OST!

SEE ALSO: Crush secures quadruple crown on circle chart with OST 'Sorry, Hate You, Love You'

The R&B singer's smooth vocals are perfect for "Night I Can't Fall Asleep" featuring Punch. The acoustic hip hop song is from the perspective of someone who misses his significant other so much he can't sleep, which is perfect for the dynamic between Jang Jae Yeol (Jo In Sung) and Ji Hae Soo (Gong Hyo Jin).

Listen to the song above!