LEETEUK IS THE LEADER.. leaders don't change.. like geai, jay was leader of 2PM but he left, so they don't have a leader.. it's the same.. when teukie goes to the army he is still their leader..
Teukie is the leader. And yes although he left for the army he still the leader of Super Junior group. it isn't Super Junior if the leaders is not Teukie. ^^
