What is the meaning of -을지?
Used to convey a doubt, or an indirect question about the future:
Used to connect a dependent clause conveying such a doubt or question to the main clause conveying judgment or a fact.
I wonder...; an intimate-style suffix introducing a doubt that one does not necessarily expect to be answered; mainly used when talking to oneself.
In the polite level, conveys a careful, indirect question; used to add further politeness than 는지 (-neunji).
Source: wiktionary.orgSearch words containing