Yvr to dps transit in seol

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I have a 20kg checked baggage allowance.

My plan:

1. Start at YVR with only a carry-on

2. Fly to Seoul (20-hour layover)

3. Buy a 29-inch suitcase there

4. Go shopping, fill the suitcase

5. Check it in Seoul for my next flight

Can I do this?

The airline is korean air

Thanks!