C430 I Have a Nosebleed
No matter how bad Yeh Xi was, she was really good to Lingmei.
However, Lingmei was not allowed to walk out of her field of vision. She was always in a world of isolation. No matter how good she was to Lingmei, it would hinder Lingmei's recovery.
This was also the reason why he had to trick Yeh Xi to come back. This way, Lingmei would come back. He had to think of a way to cure her illness