Early on in my Korean studies, I learned that in multi-syllabic words, the first consonant of a subsequent syllable is typically tensed (된소리) if the preceding syllable ends in a consonant (받침).
For example,
비빕밥
is prononunced
비빔빱
Source: https://ko.dict.naver.com/detail.nhn?docid=1845800t0
Why is it that in the word, 현장
, 장 is not pronounced 짱 to make it 현짱
? I realize there are exceptions to the rule, but they seem to be very frequent.
Conversely, there are words that have a second syllable that is tensed, even if the preceding syllable does not end in a consonant.
For example:
사건
is pronounced
사껀
Is there a rule here as well?