Had it not been for Gu Youyou today, this secret would have likely remained unknown forever, effectively allowing them to succeed.
"First, put on your trousers," Gu Youyou spoke indifferently, "To properly reattach these two tendons, surgery is needed. I have to go back and prepare a few things."
Her sympathy for King Jin grew; in this era, there was only one standard to judge a man's capability to father children, and that was whether he could perform.
It was merely a vasectomy—naturally it wouldn't affect his sexual function. Moreover, considering the fragile male ego of the time, without anyone informing him, King Jin would never have suspected this.
Thus, it was his own naivety that led to his demise.