How many movies have Gong Hyung-jin and Kang Je-kyu collaborated on?

They have worked on 4 movies together! Their first movie together was Let's Look at the Sky Sometimes (1990) while their highest rated movie together was Tae Guk Gi: The Brotherhood of War (2004). They have not worked together since Tae Guk Gi: The Brotherhood of War (2004). They are most known for their drama films together.