Korean · Pronunciation Guide
seon-saeng-nim. Three blocks, each ending in a nasal, so the word is one long stretch of resonance.
seonsaengnim
Three beats and three different nasals -- ㄴ, ㅇ and ㅁ -- in a row. The word is a compact tour of Korean's nasal inventory, and not one of the three is released or turned into a stop.
Listen: 선생님
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선생님, 질문이 있어요.
Seonsaengnim, jilmuni isseoyo.
Teacher, I have a question.
Listen: 선생님, 질문이 있어요.
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선생님, 질문이 있어요 uses the word as a term of address, and 질문이 sends its ㄴ into the particle to give jil-mu-ni. Then 있어요 supplies the sentence's only tensed consonant.
Letting a g through after 생 is the recurring error and it breaks the nasal chain. The two ㅅ letters are the other point: neither palatalizes, because neither is followed by ㅣ, so 'shon-shaeng' is an over-application of a rule that does not apply here.