Hangul syllable eun

It marks the topic and can invite a contrast. A Korean particle is a short grammatical element attached to a word to show its role. Use 은 after a word whose final syllable ends in a consonant (batchim); its partner 는 follows a vowel. In 오늘은 (“as for today”), 은 marks today as the topic.

Hangul was designed under King Sejong to represent Korean speech and make writing easier to learn. The Sejong Sillok, a court chronicle, records Hunminjeongeum, the name of the writing system, in 1443; an explanatory book with that name appeared in 1446. Hangul arranges an initial consonant, a vowel, and an optional final consonant into a syllable block, as in 은. The particle's grammatical job is separate from the block's shape.

Why can 은 imply contrast?

It can contrast, but it does not mean “but.” 오늘은 can simply establish today as the topic or contrast it with another day; the sentence supplies the alternative. A useful distinction is that 은/는 frames a topic or given information, while 이/가 often brings a subject or new information into focus.

What does 은 mean when sent alone?

The character alone does not reveal the sender's intent. If 은 is the particle, the word it marks is missing; if it is a syllable within a word, more of the word may be missing. Read the surrounding Korean before inferring agreement, sarcasm, or annoyance.