"I've been thinking about what you said about 'throwing a bone to a beggar'. At first, I thought that the beggar you were talking about was your father." Shen xuanran then realized that the 'beggars' she was referring to were Wu Chunhe and Li Nanfeng, the two beggars who had benefited from father su.
Her words had been giving Shen xuanran many clues. On one hand, her plan was flawless. On the other hand, she had deliberately led Shen xuanran to know more. In the end, even though she knew that she might be the real 'murderer', she was still helpless and could only watch her show off in front of her.
Shen xuanran had actually thought about it carefully and had been wondering why she had done it.
If she really wanted to kill someone, with her intelligence, she had many ways to cover up the case and not give herself away. She could even not give herself any clues, which would save her a lot of trouble and distress.