C1512 Absolutely Impossible!

"Ningning? Why do you look unhappy?"

Si Xiaoyan broke away from her excitement and when she saw Su Ningning's slightly worried look, she also became nervous, "Could it be that there is a problem with which step?"

" Ah, yes! "

Su Ningning came back to her senses and nodded. She quickly pointed out the key points of the problem. "This is the data that Chu gave me when he left