▁back ▁off ▁from ▁inv ading ▁the ▁Song ▁dynast y ▁in ▁fear ▁of ▁losing ▁the ▁entire ▁J urch en ▁kingdom ▁army . ▁ ▁Development ▁Kevin ▁Ch eng ▁was ▁originally ▁considered ▁for ▁the ▁lead ▁during ▁the ▁drama ▁development ▁stage , ▁but ▁had ▁to ▁turn ▁down ▁the ▁role ▁due ▁to ▁his ▁conflic ting ▁schedule ▁of ▁film ing ▁in ▁Main land ▁China . ▁The ▁lead ▁male ▁role ▁was ▁then ▁offered ▁to ▁Steven ▁Ma ▁by ▁TV B ▁executive ▁Catherine ▁Ts ang , ▁but ▁Ma ▁turned ▁down ▁the ▁role ▁as ▁well ▁since ▁he ▁decided ▁not ▁to ▁renew ▁his ▁TV B ▁contract . ▁Char ma ine ▁She h ▁was ▁offered ▁the ▁female ▁lead ▁as ▁a ▁return ▁to ▁TV B , ▁but ▁turned ▁down ▁the ▁role ▁as ▁she ▁did ▁not ▁want ▁to ▁act ▁in ▁a ▁w ux ia ▁drama ▁at ▁that ▁time . ▁ ▁The ▁original ▁ 1 ▁minute ▁ 1 8 ▁seconds ▁sales ▁presentation ▁clip ▁shown ▁in ▁ 2 0 1 2 ▁featured ▁Kenneth ▁Ma , ▁Ken ny ▁W ong , ▁Raymond ▁W ong ▁Ho - y in , ▁A ime e ▁Chan ▁and ▁Pr isc illa ▁W ong . ▁The ▁plot ▁shown ▁on ▁the ▁sales ▁clip ▁was ▁about ▁assass ins ▁but ▁was ▁later ▁announced ▁that ▁the ▁story line ▁would ▁be ▁re - written ▁to ▁be ▁somewhat ▁similar ▁to ▁" The ▁Four ▁Great ▁Const ables " ▁story line . ▁ ▁In ▁April ▁ 2 0 1 3 ▁it ▁was ▁announced ▁that ▁Sel ena ▁Li ▁will ▁be ▁part ▁of ▁the ▁supporting ▁cast . A ime e ▁Chan ▁was ▁originally ▁scheduled ▁to