▁the ▁other ▁tra ine es , ▁Le ete uk ▁became ▁the ▁leader ▁of ▁the ▁group . ▁ ▁Le ete uk ▁has ▁explained ▁that ▁he ▁uses ▁a ▁stage ▁name ▁due ▁to ▁his ▁desire ▁to ▁have ▁a ▁name ▁with ▁the ▁same ▁effects ▁as ▁K ang ta , ▁and ▁also ▁to ▁prevent ▁confusion ▁between ▁veter an ▁actress ▁Park ▁Jung - so o ▁and ▁himself . ▁His ▁stage ▁name ▁Le ete uk , ▁meant ▁" special ". ▁He ▁previously ▁rejected ▁two ▁of ▁the ▁stage ▁names ▁designated ▁to ▁him ▁by ▁his ▁ag ency . ▁The ▁ag ency ' s ▁chairman ▁at ▁the ▁time , ▁Lee ▁So o - man ▁called ▁him ▁" a ▁special ▁child " ▁and ▁said ▁the ▁name ▁Le ete uk ▁su ited ▁him ▁better . ▁▁ 2 0 0 5 – 2 0 0 8 : ▁Deb ut ▁with ▁ ▁Super ▁Junior ▁and ▁sub - groups ▁ ▁Le ete uk ▁officially ▁deb uted ▁as ▁part ▁of ▁the ▁ 1 2 - member ▁project ▁group , ▁Super ▁Junior ' 0 5 ▁on ▁November ▁ 6 , ▁ 2 0 0 5 ▁on ▁S BS ' ▁music ▁program ▁Popular ▁Songs , ▁performing ▁their ▁first ▁single , ▁" Tw ins ▁( K no ck ▁Out ) ". ▁Their ▁debut ▁album ▁Super J un ior 0 5 ▁( Tw ins ) ▁was ▁released ▁a ▁month ▁later ▁on ▁December ▁ 5 , ▁ 2 0 0 5 ▁and ▁deb uted ▁at ▁number ▁three ▁on ▁the ▁month ly ▁M IA K ▁K - pop ▁album ▁charts . ▁ ▁In ▁March ▁