How many movies have Hwang Chang-gi and Kim Hyeong-seok collaborated on?

They have worked on 4 movies together! Their first movie together was The Silenced (2015) while their highest rated movie together was MAL·MO·E: The Secret Mission (2019). They have not worked together since MAL·MO·E: The Secret Mission (2019). They are most known for their thriller films together.