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Bai Suying, a talented athlete from a women’s sports academy, gives a stand-out performance at a school demonstration and is awarded “the outfit of a heroine.” Donning the swashbuckling costume, and pasting on a moustache, she hones her talents at archery and swordplay. Soon, a summons addressed to “my son Tiemin” arrives from her father, asking for help in reclaiming the Gongbao Herding Ground, which has been seized by the gang of Pan Debiao.