This paper reports on a young Korean boy's target-like and non-target-like uses of the Korean negation marker "ani" to express various types of negation in Korean, observed approximately between the ages of 2;2 and 2;5. Besides the target-like usage of "ani" as a sentential adverb for a 'no' response, he used "ani" in place of Korean short-form negation markers "an" and "mos," non-existential predicate "epsta," and prohibitive predicate "malta." Discussions regarding why the duration of his extended use of "ani" differed between the non-target-like uses and his placement of the negation marker are provided. Overall, such extended use of ani may have been a deliberate and practical strategy for him to express various types of negation in Korean when he did not yet acquire or was not able to readily retrieve the appropriate negation markers.