Su Yan's father's will clearly stated that if he passed away before Su Yan reached adulthood, then no matter who adopted Su Yan, they would give a sum of money to raise Su Yan until she grew up. This sum of money was more than enough to raise a child.
The Su family's company had met with a crisis more than ten years ago and was on the verge of bankruptcy. Because they knew about this information beforehand that they adopted Su Yan successfully and saved their small company.
If Su Heng and his wife had treated Su Yan well, Su Yan wouldn't have been so meddlesome. However, Su Yan's life in the Su family was terrible. Su Yan had to pay for her school fees that were earned from doing part-time jobs.
Hence, Su Yan could get a lawyer to calculate the money that the Yun family gave Su Heng after deducting the expenses of raising Su Yan. She could also deduct the remuneration that Su Heng deserved over the years. The rest could be returned to Su Yan.