Korean · Pronunciation Guide
jin-jja. Two affricates one after the other, and they are not the same: the first is plain, the second is tensed.
jinjja
Two blocks, and the contrast between them is the whole exercise. Same place of articulation, same manner, different laryngeal setting -- so if the two consonants sound alike, the tensed series has not landed yet.
Listen: 진짜
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이거 진짜 맛있어요!
Igeo jinjja masisseoyo!
This is really delicious!
Listen: 이거 진짜 맛있어요!
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이거 진짜 맛있어요! is a casual exclamation, and 맛있어요 supplies its own consonant work: the ㅅ of 맛 migrates and palatalizes to 'sh', and the ㅆ resyllabifies as a double s, giving ma-shi-sseo-yo.
Producing two identical j sounds is what almost every learner does first, and it makes the word come out as 'jin-ja'. The second consonant needs a locked throat. Aspirating it instead gives 진차, which overshoots in the other direction -- tensed is neither soft nor breathy.