Tang: Picking up a small rhinoceros and accidentally dripping blood to identify its kin?

After crossing the Tang Empire, Li Fei picked up a seriously ill little girl named Little Persimmons.

One day, when Li Fei was not paying attention, the little girl was playing with knives in the kitchen and accidentally hurt her hand.

Li Fei panicked. When he stopped the little girl, he accidentally cut his finger.

The blood dripped into the bowl and unexpectedly melted.

"Huh?" His biological sister? Is this nonsense?"