rew ▁from ▁official ▁life ▁and ▁returned ▁to ▁his ▁home ▁in ▁Mah ye on - ri . ▁This ▁explains ▁the ▁cour tes y ▁name ▁G wi ’ n ong ▁( ‘ back ▁to ▁far ming ’ ) ▁his ▁father ▁gave ▁Das an , ▁who ▁was ▁born ▁in ▁the ▁same ▁year . ▁As ▁a ▁result , ▁Das an ▁grew ▁up ▁receiving ▁inten se ▁intellectual ▁training ▁from ▁his ▁now ▁un occup ied ▁father . ▁ ▁The ▁source ▁of ▁Das an ' s ▁intellectual ▁interests ▁can ▁be ▁trac ed ▁to ▁the ▁influence ▁of ▁the ▁great ▁scholar ▁U dam ▁Je ong ▁Si - han ▁( <0xE6> <0x84> <0x9A> <0xE6> <0xBD> <0xAD> ▁ 丁 時 <0xE7> <0xBF> <0xB0> , ▁ 1 6 2 5 – 1 7 0 7 ) ▁of ▁the ▁same ▁cl an , ▁who ▁taught ▁Je ong ▁Si - y un ▁briefly ▁and ▁was ▁then ▁the ▁main ▁teacher ▁of ▁Das an ' s ▁ancest or ▁Je ong ▁Do - ta e ▁as ▁well ▁as ▁his ▁brother ▁Do - je ▁( 1 6 7 5 – 1 7 2 9 ). ▁One ▁of ▁the ▁most ▁significant ▁think ers ▁in ▁the ▁next ▁generation ▁was ▁the ▁phil os opher - sch olar ▁Se ong ho ▁Y i ▁I k ▁( 星 湖 ▁ 李 <0xE7> <0x80> <0xB7> , ▁ 1 6 8 1 – 1 7 6 3 ) ▁and ▁he ▁saw ▁U dam ▁as ▁the ▁authentic ▁he ir ▁of ▁To eg ye ▁Y i ▁H w ang ▁( <0xE9> <0x80> <0x80> 溪 ▁ 李 <0xE6> <0xBB> <0x89> ,