You can bring up to two pieces of carrying on baggage within the specified size (first: 40×25×55 cm, second: 35×25×45 cm).
Up to 7kg is free. If this is exceeded, an additional fee will be charged. (Maximum up to 15㎏)
Overweight charge for carry-on baggage can be purchased at least 24 hours before the departure time.
You cannot purchase overweight charge of carry-on baggage at the airport on the day of departure.
If the weight over than restriction, please check in as checked baggage.
Please see details here.