BOTH Ning Shufen and Cheng was inside the cave. It was the same cave that she found in her past life, she also wondered why did Cheng knew this and didn't look shocked when she mentioned the book.
It looks like he knew it too however he was making it look like he didn't. He clearly knew it but pretending not to, his body was comfortable walking to any traps like he knew the back of it.
"Cheng-ge"
Her voice was heard by him and he stopped. Cheng knew that Ning Shufen noticed something unusual to him.
"Hm?" He did not paid attention to her and was still walking to the traps.
"Nothing" Shufen sighed and decided not to talk. He has his own privacy and she has her own. She won't force someone to talk when they clearly don't want to.
She didn't notice his little smile when he heard her sigh. She only had to ask and he will answer, it's not like it was a secret to him. It will depend to the person he was talking to.
"Done"
