Accidental Insemination, The CEO's Child

A husband and his mistress want a baby together, and the woman they use to carry it is his wife. She goes through artificial insemination believing the child will be hers and his. After she conceives she learns that he has been unfaithful for a long time and that the embryo came from him and the other woman. Then the hospital admits to a mix-up. The embryo had come from someone else entirely, the richest man in the city, and he wants the child. She signs an agreement with him to keep the baby safe and soon works out that he means to keep the child and get rid of the mother. She fakes her own death to get away from him and from her ex, who is still coming after her, and disappears. Five years later she returns with a daughter, working as a painter under the name W and well known by then. The girl is seriously ill. Her parentage and her illness come out at the same time, and the man who fathered her says "Please, give me one chance" and sets about trying to get her and the girl to come back to him.