What 춬 means
춬 is one written Korean syllable, not a complete message. Say it roughly like “chuk”: ch as in “chin,” oo as in “moon,” then a final k. Its three Korean letters are ㅊ, ㅜ, and ㅋ; if it arrives alone, ask what word or thought it belongs to.
Hangul was designed in 15th-century Korea to write Korean speech. Korean letters, called Jamo, join into syllable blocks; the first record of this writing system is dated 1443, and an explanatory book appeared in 1446. Font designs can arrange the parts differently without changing the underlying character.
Neutral as writing; hard to decode as a one-syllable message.
One isolated 춬 is not enough to infer the sender’s intent.
Questions people ask
1Why does 춬 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 춬
춬\CDACCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.