Remember, this is not a fine. It is clearly stated on the ticket that the weight of the checked baggage is 23kg for free, and the rest will be paid.
Korean Air is very EX, and it also has requirements on the size and weight of the luggage to be carried on the plane. Because Koreans go abroad with big bags and small bags, the consignment is controlled at 23 pieces, which is full.
If it's not urgent, such as blankets and winter clothes, you can have them sent to your home by sea. People who have been there tell you that you will throw away as many things (except food) as you bring now after half a year.
I remember going to JAL in the future won't cost much money. The service is good, and you can also check two pieces of 23kg luggage. Buying air tickets or shopping with JAL credit card can praise mileage and save one ticket a year (open for half a year)