Yun Ji
There are 2 possibilities, her father only wants get advantage from yin constitution, or her father left to search medicine to cure her mother
Till now, this story seem really interesting... Specially, my mind is kind of exhausted from all that white lotusses and green tea's, its quite reassuring that our FL have her mother with her, with a (for now, and wish for a long time) female (quite rare) friend and relatives who are taking care of them (even if they'r just 2 or so persons). Can't wait to keep reading so that's what imma go do hehehe ~~