How many movies have Hong Seok-yeon and Park Seo-bin acted in together?

They have worked on 1 movie together! Their first movie together was A Worker, Daesoo Heo Who Doesn't Want to Be Grandpa (2008) and was their highest rated movie together. They have not worked together since A Worker, Daesoo Heo Who Doesn't Want to Be Grandpa (2008).