The refund information is as follows:
~2/28, ~8/31 : full refund
3/1~3/31, 9/1~9/30 : return 5/6 of the tuition fee
4/1~4/30, 10/1~10/31 : return 2/3 of the tuition fee
5/1~5/31, 11/1~11/30 : return 1/2 of the tuition fee
6/1~6/30, 12/1~12/31 : no refund