Write to jjsoftwareint@gmail.com. Replies usually take a few days. English and Korean are both fine.
Or use the form
The form opens the message in your own mail app, addressed to the e-mail above. Nothing is stored on this site.
What is useful to include
For a correction: the city, the path name and the stop. For a new path idea: the area and roughly how long the walk is. Links to Naver Map places or a video of the walk help a lot.