1894 Corea, the hermit nation - William Elliot Griffis
To the house of Ni belongs also the greater honor of abolishing at least two cruel customs which had their roots in superstition. Ko-rai-chang, though not fully known in its details, was the habit of burying old men alive. 고려장은 자세한 건 모르겠고 노인을 산 채로 묻는 것이다.
http://qindex.info/i.php?x=36159

-