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Using the search function will bring up quite some threads dealing with connections in Munich.
30 Minutes is a legal connection time for MUC so you should be fine with your flights. The airport is designed for very quick connections. The only issue is when your flight is significantly delayed.
How booked business class is should have no influence on your chance of catching the flight. You will get your MUC-PEK boarding bass in BRN already so your seat will be confirmed at this stage already.