"It's me Jenny." The indefinite "it" is usually unsaid in Korean. So it will be: - 나야, 제니. ("야" is the informal-casual style of "이다" which corresponds to "is"). - 나 제니야. Other styles would be: 나 제니다 (formal-casual) / 저 제니예요 (informal-polite) / 저 제니입니다 (formal-polite)