How many movies have Chang Choon-Un and Seong So-min acted in together?

They have worked on 4 movies together! Their first movie together was Great King Sejo (1970) and was their highest rated movie together. They have not worked together since One Who Comes Back and the Other Who Has To Leave (1972).

One Who Comes Back and the Other Who Has To Leave (1972)

Role
Man 1
Role
Boss Yoon

Cruel history of Myeong Dong (1972)

Role
Henchman 7 (ep. 3)
Role
Head of the Detective Department (ep. 2)

Whirl of Betrayals on Myeongdong (1972)

Role
Man-ho's Henchman 7
Role
Gyeong-bin

Great King Sejo (1970)

Role
Role