The change in Eldest Gu's attitude wasn't something that happened overnight—he had vaguely accepted certain premises beforehand.
He found out about this news on the twelfth day, and by the twenty-first day, his teacher called again, saying the other party had responded that the cancer cells on the child had been cleaned up almost completely; three days later, they were requested to take the person out.
The explanation given by Luohua Manor was that these three days were for observation to see if there's any relapse—only Hua Hua and Feng Jun knew that within these three days, they had to completely clear the patient's body of all gu insects and eggs.
In fact, Luohua Manor never provided any explanation to the patient's side, but the reactions from the patient and family members were quite peculiar, turning from initial skepticism and even dissatisfaction to blind superstition now.