*You can not say '멀이에요'. '이에요/예요' is only followed by a noun. But '멀' is a verb stem of '멀다'. e.g. ) 저는 한국 사람 (noun) + 이에요 --> 저는 한국 사람이에요. (I am Korean.) * The present polite ending '아요/어요' is conjugated with a verb stem. e.g. ) 예쁘 (the verb stem of 예쁘다) + 어요 --> 예뻐요. 제 친구는 예뻐요. (My friend is pretty.)

Also, what we would consider adjectives, are often conjugated like verbs in Korean.