How many movies have Jang Joon-hwan and Sul Kyung-gu collaborated on?

They have worked on 3 movies together! Their first movie together was Phantom: The Submarine (1999) while their highest rated movie together was 1987: When the Day Comes (2017). They have not worked together since 1987: When the Day Comes (2017). They are most known for their thriller films together.