i'm looking as well. All I found in the credits was:
"OST Onha
Wind- 최 치 호 (Chorus. 홍 청 화)
Face On- CHOYY"
Google translate says:
(Wind- Choi Ji Hong (Chorus. Hong Cheong Hwa)
I'm sorry. I don't know what to do with this information. I hope someone can find the song.