I've been to SK numerous times. The older people dislike Japan A LOT. But their biggest base is a US one. I've never heard fear of the JDF. They have another more problematic neighbor.

The United States - who made the constitution that banned the military - does exercises with and supports the JDF. Idk if that fits unconstitutional anymore.

Their denial of horrid events and their attempts to suppress the fact that comfort women happened is undeniably awful though and shows many did not learn.