Help, Why Did My Young Wife Turn into a Sick Girl?

Due to an accident, Shen Nian was bound to a system and traveled to an ancient time. There was no plot that she needed to correct, and there was no male protagonist that she needed to guide. As long as she raised a child, she could return to modern times and get huge bonuses. Shen Nian thought, isn't this here to give her money? It's just raising a child. What's the problem? So Shen Nian started a life of diligently raising babies. When she successfully returned to modern times and had only been enjoying herself for a few days with a huge bonus, she was told that there was something wrong with the baby she was raising. Shen Nian was confused. At first, she only said that she wanted to raise the baby, and did not say that there was any after-sales service. After Han Shi lost his mother when he was young, he thought he would not survive, but he did not expect to meet a sister who had been rescued by his mother. He knew that the sister took him in because of his mother, so he worked hard to make progress, please, and be good. But why did she leave him? Since being gentle and pitiful could not make his sister soft-hearted, he had no choice but to go crazy.