Xiao Shiqing became Li Hua.
No, it was Xiao Shiqing's soul exchanging with Li Hua's.
The soul exchange happened again, but this time, it was between the two of them.
When Li Hua was once again left without the will to live, the Jade Pendant in front of her took effect. That piece of jade was requested by her original parents because she was born with a birthmark.
No one thought the Jade Pendant could have such a special function.
She discovered a secret about soul exchange and changed her mind, deciding to teach Xiao Shiqing a lesson.
As the saying goes, a knife doesn't cut one's own skin, and he would never understand others' pain unless he experiences it himself.
That final meal was when Li Hua knocked Xiao Shiqing unconscious, but in turn, her own throat was poisoned and left mute unless a special antidote was found.
When they woke up again, she had turned into him, and he had turned into her.
Then "he" took the comatose "her" back to the Xiao Family.
