It's next to impossible to find sources for Korean family members due to lack of indexed records. If we could get a project started I'm sure this would be helpful to many searching for connections to lost family as well as distant ancestors.
The public never knows what indexing projects exist until we see them on the Find Batches page. I'm sorry that I don't have a better answer.
That's a shame considering the records are already available, just not indexed. :/