I think you should use past perfect in 'than' clause because the time of 'than' clause precede than that of the main clause, as in following: I thought he was in a worse condition than he had been. Or Simply: I thought he was in a worse condition than before. Or I thought he was in a worse condition.
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park sang joonI think you should use past perfect in 'than' clause because the time of 'than' clause precede than that of the main clause, as in following:I thought he was in a worse condition than he had been.That is not correct.
park sang joonCan't we need the past perfect in 'than' clause?No.
park sang
I don't know the why; I'd like to know why do you think #1 is possible and that #2 is impossible.
That is not correct.