This is the 1301st most frequent Korean word.
누가
"누가" means "who" (subject form) in English.
In this sentence, '누가' is used as an interrogative pronoun to ask about the subject who performed the action of reading.
누가 그 책을 읽었어요?
Who read that book?
Here, '누가' serves as the subject inquiring about the agent who communicated the information.
누가 당신에게 이를 알려줬나요?
Who informed you about this?
In this context, '누가' introduces a clause to express unknown subject carrying out the action, emphasizing an indirect question.