당 적 삼 ), ▁or ▁d ang - h ans am ▁( 당 한 삼 ). ▁ ▁Origin ▁ ▁It ▁is ▁the or ised ▁d ang ui ▁dates ▁back ▁to ▁the ▁Korean ▁Three ▁Kingdom s ▁period ▁( 5 7 ▁BC ▁- ▁ 6 6 8 ▁AD ) ▁when ▁a ▁cl othing ▁system ▁of ▁China ▁was ▁introduced ▁to ▁Korea . ▁The ▁letter , ▁d ang ▁() ▁refers ▁to ▁Chinese ▁Tang ▁D ynast y ▁( 6 1 8 ▁– ▁ 9 0 7 ), ▁so ▁d ang ui ▁may ▁have ▁been ▁adapted ▁from ▁its ▁cl othing ▁along ▁with ▁other ▁cer emon ial ▁ro bes ▁such ▁as ▁h war ot ▁and ▁w ons am . ▁Whether ▁the ▁theory ▁is ▁probable ▁or ▁not , ▁it ▁is ▁certain ▁that ▁d ang ui ▁was ▁worn ▁during ▁the ▁Jose on ▁period , ▁based ▁on ▁historical ▁documents ▁and ▁remains . ▁The ▁scholar , ▁Y i ▁J ae ▁( 李 <0xE7> <0xB8> <0xA1> ▁ 1 6 8 0 ▁ ∼ ▁ 1 7 4 6 ) ▁mentioned ▁d ang ui ▁in ▁his ▁book , ▁S ary e ▁p ye oll am ▁( liter ally ▁" E asy ▁Man ual ▁of ▁the ▁Four ▁R ites ") ▁which ▁defines ▁four ▁important ▁r ites ▁based ▁on ▁Conf u cian ism . ▁In ▁the ▁chapter , ▁G w ally e jo ▁( <0xE5> <0x86> <0xA0> <0xE7> <0xA6> <0xAE> <0xE6> <0xA2> <0x9D> ) ▁on ▁coming - of - age ▁cer emon ies , ▁sam ja ▁( <0xE8> <0xA1> <0xAB> 子 ) ▁is ▁commonly ▁called ▁d ang ui