```

"Ye Qiu, didn't you say it was a Gu worm? Why is it a snake?" Zhao Yun asked, puzzled.

"This is the Yin-Yang Serpent Gu," Ye Qiu pointed at the small snake in the fire basin. "When it was inside the Dragon King, it was only as small as a toothpick tip, hiding behind his lung and freely moving through his blood vessels. It's extremely cunning."

Sun Shengshou asked, "Dr. Ye, according to what you said, it should have been discovered during previous check-ups. Why wasn't it found?"