Teaching functions of grammatical items in various contexts is useful to organize learners` grammar intuitions. So Korean learners should know functions, speakers` attitudes and implications of grammatical items in various contexts as well as abstract meanings. For this pedagogic grammar of particle `un/nun`, I analysed sentences in real Korean spoken languages. By analysing real sentences, Korean particle `un/nun` has abstract meaning of limiting the scope of invoked objects and have contrastive implication because of this meaning. And `un/nun` phrases are topics in discourse usually and involved in coherence. Lastly, speakers can use `un/nun` phrases to disagree hearers thoughts or rebuke hearers` actions pragmatically.