▁He ▁then ▁made ▁a ▁guest ▁appearance ▁playing ▁B ae ▁J ong - ok ' s ▁college ▁boy friend ▁in ▁" Out ing ", ▁a ▁two - ep is ode ▁arc ▁written ▁by ▁Lee ▁Ky ung - he e ▁for ▁the ▁om n ibus ▁drama ▁Be ating ▁Heart ▁( 2 0 0 5 ), ▁followed ▁by ▁a ▁supporting ▁role ▁in ▁Kim ▁D ae - se ung ' s ▁period ▁thr iller ▁Blood ▁Rain ▁( 2 0 0 5 ). ▁▁ 2 0 0 5 – 2 0 0 7 : ▁En list ment ▁Ji ▁S ung ▁en list ed ▁on ▁June ▁ 7 , ▁ 2 0 0 5 ▁for ▁his ▁mand atory ▁military ▁service . ▁Though ▁he ▁initially ▁en list ed ▁as ▁an ▁ordinary ▁soldier , ▁the ▁Military ▁Man power ▁Administration ▁transferred ▁him ▁to ▁the ▁military ▁promotion ▁(" ent ertain ers ") ▁unit ▁in ▁February ▁ 2 0 0 6 , ▁for ▁which ▁he ▁served ▁as ▁" public ▁amb assador ▁of ▁military ▁affairs ". ▁He ▁was ▁dis charg ed ▁on ▁June ▁ 6 , ▁ 2 0 0 7 . ▁▁ 2 0 0 8 – 2 0 1 4 : ▁Com eb ack ▁and ▁lead ▁roles ▁He ▁made ▁his ▁com eb ack ▁in ▁the ▁medical ▁drama ▁New ▁Heart ▁( 2 0 0 7 – 0 8 ), ▁playing ▁a ▁card i oth or ac ic ▁surg ery ▁resident . ▁During ▁a ▁scene ▁where ▁his ▁character ▁c ries ▁after ▁failing ▁to ▁save ▁the ▁life ▁of ▁a ▁former ▁comfort ▁woman , ▁Ji ▁S ung