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은 정말 좋은

is really good; is a really good…

→ 은
phrase Rare #20,300
is really good; is a really good… 은 marks the topic, and 좋은 usually comes before a noun, as in “a really good day.”
KO: 오늘은 정말 좋은 날입니다.
EN: Today is a really good day.

톰은 정말 좋은 남자처럼 보인다.

Tom seems like a really nice guy.

폴 배리슨은 정말 좋은 사람 이었다.

Paul Barrison was a really good person.

톰은 정말 좋은 사람 이지?

Tom is a really nice person, isn't he?