Dr. Fu is a physician mentioned in the text who provided a medical opinion regarding the health of the late eldest son of the Zhang family. Dr. Fu stated that the eldest son health condition made it highly unlikely for him to conceive a child, a fact that Zhang Lin used as evidence to cast doubt on Shen Qiuwan pregnancy and support his accusation that she was unfaithful. Dr. Fu does not appear directly in the scene but is referenced as having examined the late eldest son. The doctor medical assessment became a key piece of evidence in Zhang Lin scheme to frame Shen Qiuwan, demonstrating how even off-screen characters can influence the plot through their professional opinions.