Korean · Pronunciation Guide
mo-reu-da. A rounded 'oh', then a tap plus the flat ㅡ, then the citation ending -- three beats with a complete lip change in the middle.
moreuda
None of the three syllables is stronger than the others. This is a 르-irregular verb, so the conjugated forms double the ㄹ into a long held l -- 몰라요 -- and the citation form gives you no warning of that at all. Learning both shapes together is the practical approach.
Listen: 모르다
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잘 모르겠어요.
Jal moreugesseoyo.
I don't really know.
Listen: 잘 모르겠어요.
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잘 모르겠어요 uses the -겠 form, where the neutralized ㅆ of 겠 tenses the following ㅅ, giving mo-reu-ge-sseo-yo. Compare the plain conjugated 몰라요, where the same stem produces a geminate l, and you can hear how far the two shapes diverge.
The lip transition catches people out: 'mo-ru-da' with both vowels rounded is the usual output, when only the first is rounded. Deliberately spread the lips for the second syllable. Learners also give the middle consonant an English r, which stretches the word and blurs the boundary with the ㅡ behind it.