Why is Gu Yun deaf and blind when he kills wolves?

Gu Yun in "Kill the Wolf" is deaf and blind because of his family's hereditary bone and blood disease. This is a kind of osteopathy that runs in the family. Only people with family relationships will get this disease, which means Gu Yunhuo is only twenty years old. Unless he adopts another method, that is, adopting his son-in-law to a heterosexual family, the conditions will get better after fake marriage until he lives to be 50 years old. Moreover, this cure is limited by one person and can only be used once. Therefore, Gu Yun's deafness and blindness were caused by his family's ancestral osteopathy, rather than being poisoned.