Hi,

I noticed you added back in the Seoul node e.g. the Seoul boundary relation. That by itself is fine, however, I would recommend to set the *node* to admin_level=2 instead of 4, the highest level it represents. 

It is a frequent misconception that people think the *node* needs to have the same admin_level of a boundary *relation* it is part of.

This is not true. 

The simple proof of that is already in the fact that this node is part of both a boundary *relation* with admin_level 2 representing the entire country of South Korea:
https://www.openstreetmap.org/relation/307756

And a local admin_level=4 relation representing the Seoul administrative or metropolitan area:
https://www.openstreetmap.org/relation/2297418

In this case, almost all other countries in the world have the *node* of the country capital set to admin_level=2, not 4 or whatever lower admin_level is appropriate for a corresponding boundary *relation*.

This allows renderers to properly display the node as country capital, without having to parse all possible relations the node is part of in search of the one with the highest (country) level admin_level tag, which is cumbersome.


