BJS = PEK.

But yes, if its less than 24 hours you can check your bags through with CA by showing them your CZ itinerary. You will still need to find a CZ desk in PEK to get your ticket to HAN though.

Also, have a print out of your full itinerary if you are transiting through PEK without a visa, it will save you lots of time at immigration as they won't have to call an airline representative.