"The Korean government introduced a law in 2007 that required Chinese workers of Korean descent with no relatives in Korea to attain more than 200 points (out of 400) in the Business TOPIK (B-TOPIK) so they could be entered into a lottery for work visa.[3][4]"

"Use of the test result"

"To obtain marriage based immigrant visa"

https://en.wikipedia.org/wiki/Test_of_Proficiency_in_Korean

Korean immigration language requirements are more difficult than American immigration language requirements?