Fang Yao told her about those two sisters.
Qu Lu was adopted by the Qu family. She was already six years old when she first came from the orphanage. She had suffered a lot there, so when she first came into the household, she did not talk much and was wary of everyone.
At that time, Qu Lin's mother was already quite old. She thought that she would not be able to bear a child, so she treated Qu Lu as her biological child and took good care of her.
At that time, Qu Lu did not have any friends and was a little mentally unsound. Coincidentally, the Ding family had asked the Qu family for help and allowed Ding Shan and Qu Lu to play together sometimes. From then on, the two of them became friends.
Ding Shan was a few years older than Qu Lu and knew a lot of things. She taught Qu Lu all sorts of things like an elder sister. However, Ding Shan's personality was a little strange. When she was young, she liked to torment kittens and puppies.