- san ▁( c ame o ) ▁▁ ▁Park ▁He e - so on ▁as ▁Kim ▁J ang - ok ▁ ▁Production ▁ ▁On ▁August ▁ 3 , ▁ 2 0 1 5 , ▁it ▁was ▁announced ▁that ▁Warner ▁B ros . ▁would ▁fin ance ▁and ▁dist ribute ▁its ▁first ▁ever ▁Korean - language ▁ 1 9 3 0 s ▁set ▁drama ▁Secret ▁Agent , ▁and ▁the ▁$ 8 . 6 2 ▁million ▁budget ed ▁film ▁would ▁also ▁be ▁produced ▁by ▁Gr imm ▁Pictures . ▁The ▁project ▁and ▁script ▁was ▁developed ▁by ▁Lee ▁Ji - min ▁and ▁Park ▁J ong - da e , ▁which ▁Kim ▁Je e - wo on ▁would ▁direct ▁and ▁the ▁cast ▁would ▁be ▁Song ▁K ang - ho ▁and ▁G ong ▁Y oo . ▁A ▁tra iler ▁was ▁released ▁on ▁July ▁ 1 4 , ▁ 2 0 1 6 , ▁reve aling ▁the ▁new ▁title ▁as ▁The ▁Age ▁of ▁Sh adows . ▁ ▁Crit ical ▁reception ▁The ▁film ▁has ▁received ▁critical ▁acc laim . ▁On ▁Rotten ▁Tomatoes , ▁it ▁holds ▁an ▁appro val ▁rating ▁of ▁ 1 0 0 %, ▁based ▁on ▁ 4 1 ▁reviews ▁with ▁an ▁average ▁rating ▁of ▁ 7 . 3 / 1 0 . ▁On ▁Met ac rit ic , ▁it ▁holds ▁a ▁weight ed ▁average ▁score ▁of ▁ 7 8 / 1 0 0 , ▁based ▁on ▁ 1 4 ▁reviews , ▁indicating ▁" gener ally ▁favor able ▁reviews ". ▁ ▁The ▁Film ▁Stage ▁gave ▁the ▁film ▁a ▁positive ▁review ,