Korean · Pronunciation Guide
chun, with a genuine burst of air on the ch and a completely unrounded vowel. One syllable, and a short one.
cheon
Single beat. In practice this word almost never stands alone -- it prefixes counters and other digits, as in 천 원 or 이천 -- so what you really rehearse is how cleanly that final ㄴ hands off to the next word.
Listen: 천
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이거 천 원이에요.
Igeo cheon wonieyo.
This is a thousand won.
Listen: 이거 천 원이에요.
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이거 천 원이에요 runs 천 into 원 with no break, and then 원이에요 shifts its ㄴ forward to give wo-ni-e-yo. The whole tail arrives as one four-beat stream, cheon-wo-ni-e-yo.
Drop the aspiration and 천 slides toward 전, a completely separate morpheme. English ch in 'chin' carries some aspiration but less than Korean's, so push harder than feels natural. Then fix the vowel: 'chon' with rounded lips is wrong, because ㅓ demands flat, relaxed lips.