, ▁he ▁und erm ined ▁much ▁foundation ▁of ▁the ▁many ▁systems ▁including ▁the ▁Ji ph ye on je on ▁which ▁his ▁prede cess ors ▁King ▁Se j ong ▁and ▁Mun j ong ▁had ▁carefully ▁laid ▁down , ▁cutting ▁down ▁on ▁everything ▁he ▁de emed ▁un worth y ▁of ▁the ▁effort ▁and ▁thus ▁caused ▁count less ▁comp lications ▁in ▁the ▁long ▁run . ▁Much ▁of ▁his ▁own ▁adjust ments ▁were ▁done ▁for ▁his ▁own ▁power , ▁not ▁regarding ▁the ▁consequences ▁and ▁problems ▁that ▁would ▁occur . ▁Furthermore , ▁the ▁rel ent less ▁favor it ism ▁which ▁he ▁showed ▁towards ▁the ▁minister s ▁who ▁a ided ▁him ▁in ▁the ▁taking ▁of ▁the ▁throne ▁led ▁to ▁much ▁cor ruption ▁in ▁the ▁higher ▁e ch el on ▁of ▁the ▁political ▁field . ▁ ▁Institution al ▁arrang ements ▁and ▁Pro s per ▁culture ▁Se jo ' s ▁weak ▁son ▁Ye j ong ▁succeeded ▁him ▁as ▁the ▁e ighth ▁king , ▁but ▁died ▁two ▁years ▁later ▁in ▁ 1 4 6 9 . ▁Ye j ong ' s ▁nep hew ▁Se ong j ong ▁asc ended ▁the ▁throne . ▁His ▁reign ▁was ▁marked ▁by ▁the ▁prosper ity ▁and ▁growth ▁of ▁the ▁national ▁economy ▁and ▁the ▁rise ▁of ▁ne o - Conf u cian ▁sch ol ars ▁called ▁sar im ▁who ▁were ▁encourag ed ▁by ▁Se ong j ong ▁to ▁enter ▁court ▁politics . ▁He ▁established ▁Hong m ung wan ▁( ), ▁the ▁royal ▁library ▁and ▁advis ory ▁council ▁composed ▁of ▁Conf u cian ▁sch ol ars , ▁with ▁whom