What is the meaning of -지?

Used to contrast two facts regarding the same topic, thereby emphasizing both facts. In conversation, it is usually used to deny or qualify something the other person has said. The second fact tends to be negated or a rhetorical question.

Used to strongly emphasize a fact by connecting two differently worded statements amounting to the same meaning. The second statement tends to be negated or a rhetorical question.

In the intimate style, a general-purpose sentence-final suffix with a more affirmative sense than (-eo):

  1. In the declarative mood, used to strongly affirm that something is the case.

    In the declarative mood, used to strongly affirm that something is the case.

    right?; in the interrogative mood, used to request confirmation about something one believes.

    In the imperative mood, used to soften orders and make them more indirect.

    Used for the negated verb or adjective in "long negation".

    Only used in 는지 (-neunji), 은지 (-eunji), 던지 (-deonji), 을지 (-eulji), and 을는지 (-eulleunji).

    Source: wiktionary.org