▁to ▁use ▁I v ana . ▁Prior ▁to ▁release , ▁the ▁media ▁reported ▁that ▁the ▁story ▁was ▁based ▁on ▁the ▁life ▁of ▁ps y cho ▁k iller ▁Jay ap rak ash , ▁who ▁killed ▁nine ▁of ▁his ▁relatives ▁in ▁the ▁ 1 9 8 0 s ▁at ▁Val as ar av ak k am , ▁Chen na i . ▁ ▁The ▁principal ▁shoot ▁of ▁the ▁film ▁began ▁in ▁March ▁ 2 0 1 7 , ▁with ▁a ▁first ▁look ▁poster ▁released ▁featuring ▁J y oth ika ▁and ▁G . ▁V . ▁P rak ash ▁K umar . ▁As ▁P rak ash ▁K umar ▁was ▁working ▁simultaneously ▁on ▁four ▁other ▁projects , ▁he ▁requested ▁some ▁time ▁before ▁starting ▁the ▁shoot . ▁Instead ▁of ▁delay ing ▁the ▁project , ▁B ala ▁worked ▁sole ly ▁on ▁J y oth ika ' s ▁scenes ▁to ▁ensure ▁the ▁film ▁was ▁shot ▁within ▁the ▁project ed ▁time ▁of ▁forty ▁days . ▁By ▁the ▁time ▁he ▁joined ▁the ▁set , ▁P rak ash ▁K umar ▁reported ▁to ▁sets ▁by ▁ 6 ▁am ▁every ▁day , ▁took ▁an ▁hour ▁to ▁put ▁three ▁layers ▁of ▁dark ▁make - up ▁and ▁col oured ▁his ▁hair ▁to ▁a ▁brown ish - or ange ▁colour . ▁Un like ▁several ▁of ▁B ala ' s ▁previous ▁films , ▁Na achi yar ▁completed ▁production ▁quickly ▁and ▁by ▁early ▁July ▁ 2 0 1 7 , ▁" n in ety ▁percent " ▁of ▁the ▁shoot ▁was ▁revealed ▁to ▁be ▁over , ▁with ▁most ▁scenes ▁fil med ▁in ▁North