How many movies have Ko Chun-Hsiung and Sun Ya-Tung acted in together?

They have worked on 3 movies together! Their first movie together was The Kinmen Bombs (1986) while their highest rated movie together was The Beheaded 1000 (1993). They have not worked together since The Beheaded 1000 (1993). They are most known for their war films together.