This is the 17262nd most frequent Korean word.
서한은
"서한은" means "Seohan is" or "as for Seohan," often used to indicate or introduce the topic in a sentence involving the name "Seohan."
In this context, '서한은' is used as a proper noun, referring to a person's name, indicating the subject of the sentence.
서한은 편지를 썼다.
Seo-han wrote a letter.
Here, '서한' refers to a formal written communication or letter (a noun), and '은' is a topic marker particle attaching to it for emphasis.
회사는 서한은 송달했다.
The company sent out a formal letter.
'서한은' is used again as a proper noun, where '서한' is someone's name and '은' acts as a topic marker.