Dongyi people
There were dolmen or stone mound tomb wherever Dongyi people lived in with Bakdal tree.
Their people made a tomb whenever their king or Je passed away.
Dolmen is that tomb was completed by stacking small stone around corpse, cutting a huge stone from mountain and stacking the tomb with this huge stone.
If virtue of the deceased is greater, then the period of sorrow of all people is longer and the size of a huge stone is bigger.
When Dongyi people make a deep bow in front of a tomb or their elders,
they have a unique form of hands.
They stacked right hand with left hand and thumbs are crossed each other.
When Dongyi people make a tomb or build a house,
they have a unique direction of layout.
If there is a stream at the south of a mountain, they build a house between mountain and stream.
And the direction of living room is always toward south to receive sunshine.
They have irrigated in front of home, made a field and did rice farming.
After Wanggom found Chosun to benefit all mankind,
Dongyi people reaped a rich harvest for the first time at Buru the next Je.
To pay a tribute to Tangun Buru with keeping a rice in comb-pattern pottery, is called 'Burudanji' ever since.