I see no difference in meaning with or without the comma.
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park sang joonSo I'd like to know whether my example is a dialect as in the usage #1 of "Merriam-Webster."This definition is not relevant to your sentence. The relevant definition is this one:
in the way or manner that
Don't lose your passport,
park sang joonThank you, GPY, for your continuing to support. Then, Do you think 'as' clause in my example is a relative clause and adjective clause?No, I see "as" as a conjunction.