발소리가

the sound of footsteps

→ 발소리
phrase Rare #28,149
the sound of footsteps The subject particle 가 marks 발소리 (the sound of footsteps) as the subject of the sentence.
KO: 복도에서 발소리가 들려요.
EN: I hear footsteps in the hallway.

발소리가 들린다

I can hear footsteps.

— 러시아 방주 (2002)