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I can’t read korean unfortunately but if I interpret that website correctly, the data is licensed under a version of the Creative Commons - Attribution license.
That license is unfortunately not directly compatible with OSM because there is uncertainty about the exact attribution requirements. Explicit permission by the rights holder or clarification whether they agree that being listed here is enough to fulfill the attribution requirements is therefore needed.

https://wiki.openstreetmap.org/wiki/Creative_Commons
https://blog.openstreetmap.org/2017/03/17/use-of-cc-by-data/

CC BY 4.0 allows some more flexibility in how a licensee can attribute the original source and many people have suggested that our indirect attribution mechanism already fulfills the requirements of BY 4.0. However the OSMF believes that licensors of BY 4.0 material may be surprised by this and that we should, for courtesy and good form reasons, continue to ask for explicit permission to attribute via our websites.

There are template letters available here

Also, see the OSM import guidelines in general

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