Korean · Pronunciation Guide
chun-ma-ne-yo, four beats. The ㅊ that opens it needs a real puff of air, and the ㄴ ending 만 slides forward to become the onset of the next syllable.
cheonmaneyo
Four even beats with no syllable singled out. What is worth marking is the resyllabification at the 만+에 seam: written as four blocks 천-만-에-요, spoken as cheon-ma-ne-yo, which is why the romanization looks like it has misplaced a consonant.
Listen: 천만에요
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천만에요, 언제든지 말씀하세요.
Cheonmaneyo, eonjedeunji malsseumhaseyo.
You're welcome, just ask me anytime.
Listen: 천만에요, 언제든지 말씀하세요.
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천만에요, 언제든지 말씀하세요 offers a second, longer link right after. 말씀 ends in ㅁ and 하 follows, so the ㅁ closes and the ㅎ softens almost to nothing between voiced sounds, coming out roughly as mal-sseu-ma-se-yo in relaxed speech.
Aspiration on ㅊ is what English speakers under-do. The ch of 'cheap' is already aspirated but less forcefully than Korean's, and learners hedge back toward the plain ㅈ; under-aspirate and 천만 starts drifting toward 전만. The other giveaway is pronouncing the written 에 as its own separate 'eh' -- cheon-man-EH-yo -- which sounds stiff and over-enunciated to a native ear.