I'm not sure how you came to that conclusion. Words can independently change and evolve over time, while still using the same base.
As a Chinese speaker, Korean very much sounds closeish and Japanese is often similar enough to realize a distant split.
It is important to remember that all branches of a tree grow. China has thousands of dialects all co-evolving and we don't know which the others could have split from and how far either has changed
As a Chinese speaker, Korean very much sounds closeish and Japanese is often similar enough to realize a distant split.
It is important to remember that all branches of a tree grow. China has thousands of dialects all co-evolving and we don't know which the others could have split from and how far either has changed