C574 574 sigh they're related by blood!

Ruan Suixin's eyes lit up: "Older Man Gu, quickly tell me, what's the use of all this?"

"Don't worry, after knowing that this kid has cold poison, Grandfather has flipped through all the medical books in the house from beginning to end. The medical book to treat cold poison s did not come out, but he did find a way to make the people of cold poison s, the descendants of cold poison s