Slavadesi

Hello, if you know which Chinese story this description is about, could you please write me the name of the story!?
          This is the one I read a long time ago and now I can't get it out of my head and I wonder about it to read it again!
          In it, the main character has a child from the main character, she gives birth to the child in an accident and works hard to support them, she even sells her blood to buy a doll for her daughter, the man wants nothing to do with the child, but an accident happens and he can't have any more children so he finds the child and asks for custody, meanwhile the mother has found a new score and the child likes it, it's a person who works at the hospital where she donated blood! There is also a scene where the little child makes a promise to a boy later