▁H ye j ang ▁request ing ▁some ▁tea ▁leaves ▁from ▁the ▁hill ▁above ▁the ▁temple ; ▁it ▁is ▁dated ▁in ▁the ▁ 4 th ▁month ▁of ▁ 1 8 0 5 , ▁very ▁soon ▁after ▁their ▁meeting . ▁ ▁This ▁poem ▁makes ▁it ▁clear ▁that ▁Das an ▁already ▁knew ▁the ▁medic inal ▁value ▁of ▁tea ▁and ▁implies ▁that ▁he ▁knew ▁how ▁to ▁prepare ▁the ▁leaves ▁for ▁drink ing . ▁It ▁has ▁often ▁been ▁claimed ▁that ▁Das an ▁learned ▁about ▁tea ▁from ▁H ye j ang ▁but ▁this ▁and ▁a ▁series ▁of ▁other ▁po ems ▁ex changed ▁between ▁them ▁suggests ▁that ▁in ▁fact ▁H ye j ang ▁and ▁other ▁mon ks ▁in ▁the ▁region ▁learned ▁how ▁to ▁make ▁a ▁kind ▁of ▁c aked ▁tea ▁from ▁Das an . ▁ ▁This ▁would ▁make ▁him ▁the ▁main ▁origin ▁of ▁the ▁en su ing ▁spread ▁of ▁interest ▁in ▁tea . ▁In ▁ 1 8 0 9 , ▁the ▁Ven . ▁Cho - ui ▁from ▁the ▁same ▁D ae he ung - sa ▁temple ▁came ▁to ▁visit ▁Das an ▁in ▁Gang jin ▁and ▁spent ▁a ▁number ▁of ▁months ▁studying ▁with ▁him ▁there . ▁Again , ▁it ▁seems ▁more ▁than ▁likely ▁that ▁Cho - ui ▁first ▁learned ▁about ▁tea ▁from ▁Das an , ▁and ▁adopted ▁his ▁very ▁specific , ▁rather ▁arch a ic ▁way ▁of ▁prepar ing ▁c aked ▁tea . ▁After ▁that , ▁it ▁was ▁the ▁Ven . ▁Cho - ui ▁who , ▁during ▁his ▁visit ▁to ▁Se oul ▁in ▁ 1 8 3 0 , ▁shared ▁his