난 알아요

I know

→ 나+는
phrase Uncommon #10,093
I know 난 is a shortened form of 나는 (“I” as the topic), and 알아요 is the polite form of “know.”
KO: 난 알아요. 그 사람이 누구인지요.
EN: I know who that person is.

난 알아요.

I know.

— 듄 (2021)

난 알아요?

How should I know?

— 신경쇠약 직전의 여자 (1988)