Hangul syllable ddwen

By itself, 뛘 gives a syllable sound; context gives the meaning.

Hangul puts an initial consonant, vowel, and optional final consonant into one syllable block. Those component letters are called jamo; 뛘 is the block they form.

The Korean alphabet now called Hangul was announced under its original name, Hunminjeongeum, in 1443, as recorded in the Sejong Sillok, a chronicle of King Sejong’s reign; an explanatory book followed in 1446. It was designed so people could write Korean speech more directly and learn the script more easily than through Chinese characters. A 1989 discussion of Korean orthography reflects a shift from spelling by sound toward keeping word parts recognizable when pronunciation changes. It lists 뛘 among syllables possible when a verb ending in -어 combines with the grammatical ending -는.

What does 뛘 mean when someone sends it?

A lone 뛘 needs surrounding Korean text to identify its intended word.

A Korean national dictionary lists 뛘 as one pronunciation of the written form 못된, alongside 뙨. The word remains spelled 못된; 뛘 records a sound rather than replacing its spelling. When the syllable arrives alone, its role is unclear, so ask for the surrounding Korean text.