Qianlong was originally the son of Minister Chen, who was switched by Yongzheng's wife through a baby-switching plot. After growing up, Qianlong learned about the hidden truth from his wet nurse. He then used the pretext of an imperial southern tour to visit his biological parents in Haining. However, at this time, Minister Chen and his wife had already passed away. Qianlong could only go to their graves, shielded by a yellow curtain, and paid respects befitting a son.