level exp = _RefLevel
mob lvl = _RefObjChar
To find the monster id go to _RefObjCommon and Find monster Code for example MOB_CH_?? , then when u find go at the same row to the last column which name is LINK and pick up the number there and search at _RefObjChar about that number in ID .
If you are going to edit lvl exp request or mobs lvl u need to edit too at media pk2 at server_dep , or u will got errors in game play , i mean fatal errors like if u change the HP of mob and don't change in media the mob seems to be bugged .
(And how i can check if user online like smc.) i can't understand what u mean .