It says:

She was the first South Korean director who was allowed to visit North Korea after Korean War without being charged for treason by South Korea, because she has a German passport. She gave up South Korean citizenship and took the German one just for making this documentary and getting a visa and the permission of shooting from North Korea

The phrasing is a bit odd, but the reference goes to a DW article, the subheading of which is:

A new film made by Sung-Hyung Cho attempts to give outsiders an insight into life in North Korea. The director, who even had to give up her South Korean nationality to shoot the film, spoke to DW about the project.