Li Caiyi's Lie

"No, that can't be…." Li Caiyi's words trailed off as her eyes shook wildly in front of what looked like her bottle of medicine.

"Madam, you seem to recognize this bottle?" The police officer in charge of interrogating her sneered, "Of course you do since your fingerprints were found all over this thing. We found this lying around near the crime scene. You must have tried to get rid of it after successfully mixing the poison into the wine."

That medicine bottle was Li Chunhua's. Her sister always brought her medicine everywhere, and that one was one of them. 

"You could try to come up with an excuse with all you want, but we found the residue of the same poison found in the wine within this bottle. As her sister, it wouldn't be weird if you helped the victim prepare her medicine, and even if you had her things with you, no one would suspect anything. That's when you swapped the content, weren't you?