Su Yueran was indeed not the Lin family's biological daughter.
Even the Lin family did not know who her biological parents were.
Back then, they had brought Su Yueran back purely because when Father Lin and Mother Lin went to attend a public service event,
in a welfare home, Su Yueran hugged Mother Lin's leg tightly after seeing her. She did not let go no matter what others said. In the end, Mother Lin had no choice but to bring her back to the Lin family.
Anyway, the Lin family did not lack that bit of money. At most, it was just another bowl at the dining table. Just like that, Su Yueran was raised by the Lin family.
Later on, Lin Qingyuan contacted Su Yueran and made her his sharp knife in Beijing.
According to Lin Qingyuan's plan, he wanted Su Yueran to seduce Jun Shiling.
However, Su Yueran was useless and could not complete the mission.
Since this knife could not be used in Beijing, it was time for her to come back.