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In Korean, topic marking particles 은 (eun) and 는 (neun) are used to indicate the topic of a sentence. The choice between the two depends on whether the preceding noun ends in a consonant or a vowel.
은 (eun) is used after a noun that ends in a consonant. And 는 (neun) is used after a noun that ends in a vowel.
Examples:
If the noun ends in a consonant:
집 (house) → 집은 (jib-eun)
If the noun ends in a vowel:
학교 (school) → 학교는 (hak-gyo-neun)
