The heavenly guardian book was the legendary book of contract.
Just as the man with the mustache had said, this contract couldn't be violated, or else it would endanger the soul.
The man with the mustache placed the heavenly guardian book in front of the two of them with a flattering smile on his face.
"Granny Qin, I was afraid that Qin Yu wouldn't keep his word, so I specially prepared the heavenly guardian book for you," the man with the mustache said with a grin.
Even though he said so, everyone knew that the man with the mustache was obviously helping Qin Yu.
If Qin Yu really lost, then he would face death, so why would he need to sign a heavenly guardian book?
Granny Qin's expression was a bit gloomy. She fiercely glared at the man with the mustache, and looked as if she wanted to swallow the man with the mustache alive.
"I don't need to sign a heavenly guardian book," Granny Qin said with a cold snort.