Hi,
It seems that KNTO 한국관광공사 does not promote much by way of offering a sample or guided World Heritage Trail in Korea (lots of information there on drama and movie film locations !).

Just wondering whether any such tour or detailed information or Goodwill Guide (a KNTO term) is available from Cultural Heritage Adminstration.

I am planning to cover 불국사, 해인사 and the Gyeongju Historic Area and mebbe even the upcoming possible addition of Hahoe Folk Village in Andong bet 29 Mar and 10 Apr.

Answer:
Sorry for a late response. I have been away from office on a business trip. As an organization whose main objectives are the preservation and protection of national heritage, we do not offer guided World Heritage Trail. You can refer to the website of local governments where the desired World Heritage Site is located. Have a nice trip!