How many movies have Kim Seo-hyung and Lee Joo-sil acted in together?

They have worked on 3 movies together! Their first movie together was The City of Violence (2006) while their highest rated movie together was Whispering Corridors 6: The Humming (2021). They have not worked together since Whispering Corridors 6: The Humming (2021). They are most known for their thriller films together.