Evidentiality is one of the important issues in the recent studies of linguistic typology whereby the Korean evidentials are not so much talked about. In Korean the evidentiality is not so systematically represented as other grammatical categories such as tense or honorifics. But it does have some means for evidential xpression. The past retrospective ending -deo- has this function. And the ''say'' verb malhada underwent many kinds of formal reduction and contraction to develop various report/hearsay evidential markers which are very frequently used in colloquial speech. The ''see'' verb boda expresses also the evidential meaning in the biclausal structure or as an auxiliary. Besides we have some other auxiliaries for this purpose. We propose two simple tests to distinguish the modal and evidential auxiliaries.