Korean · Pronunciation Guide
seul-peu-da. Two ㅡ vowels in a row, both with the lips flat, and an aspirated ㅍ sandwiched between them.
seulpeuda
All three syllables the same length. Having the same difficult vowel twice makes this a good diagnostic word: if the two syllables do not sound like they share a vowel, one of them has picked up rounding, and it is almost always the one right after the ㅍ.
Listen: 슬프다
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
그 이야기는 너무 슬퍼요.
Geu iyagineun neomu seulpeoyo.
That story is so sad.
Listen: 그 이야기는 너무 슬퍼요.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
그 이야기는 너무 슬퍼요 contracts the verb to 슬퍼요, which swaps the second ㅡ for ㅓ, so the two hard vowels of the dictionary form are not both present in the everyday one. The 이야기는 ahead of it is a run of open syllables with no clusters at all.
The bilabial release makes the lips want to round, so 'seul-poo-da' is the near-automatic English output. Force them flat right through the second syllable. Softening the ㅍ into a plain ㅂ is the other error, and it gives 슬브다 -- the aspiration is what carries the consonant's identity in this word.