It is a substitute for the idea that "history was playing out much earlier than it was supposed to" so it is a pronoun.
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park sang joon "which" ... a relative pronoun?Yes. Its antecedent is the main clause.
park sang joonIf so, shouldn't a comma be before "which"?Yes. A relative pronoun with a clause antecedent should be preceded by a comma.
Your clear and detailed accounts are very comprehensible.
I hope the terminology I’ve spouted doesn’t come off as too.pretentious or esoteric.
park sang joonYour clear and detailed accounts are very comprehensible.Thank you! I’m glad someone thinks so!