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A side note is that the traditional way to write your name in Korean is using Chinese characters, starting with “Joseon Dynasty” the your family name, then your given name.
I have encluded a link to an imgur album of some old Korean dog tags which still have that way of traditionally writing names. (Apologies for formatting and linking problems. Mobile is not being nice to me.)
View post on imgur.com
Honestly, if this sort of stuff interestes you, then go to askhistorians and ask a question. Someone will be able to point you in the right direction. But I can confirm that that is a burial mound, and the usage of them dates back centuries. The names on the mound would include the children and grandchildren of the deceased ( even though they would not be necesarily deceased themselves).
Good find though!