Ko Ho San was a member of mercantile Ko clan and a powerful wu jen. He was said once to had buried an entire town in a mudslide for a offense by the mayors son to a Ko grandniece. In 1358 after one of his brothers Ko Lei Kho, governor of Akari island, told him about the menace of the Opawang defeated the year before he started investigating about the Black Leopard Cult together with his grandson Ko La Ko. Thank to a suggestion of La Ko, Ho San individuated as central spot Hsin-to, at the mouth of the Fenghsintzu River in T'u Lung. So he hired some adventurers to accompany Ko La Ko to there in order to investigate.
Ko Ho San was kindly and polite to a fault person unless people crossed his path