How many movies have Cheon Eun-gyeong and Yang Dong-Wuk collaborated on?

They have worked on 2 movies together! Their first movie together was Thunderhawk 3 - Thunderhawk From Outer Space Blitzkrieg (1987) and was their highest rated movie together. They have not worked together since Thunderhawk 4 - Mobilization Of Thunder-V (1987).