In anger at being blamed for the death of his employer Gu Feng's son, Gu butler Fang Cneng switched his illegitimate daughter Qiangwei with Gu Feng's illegitimate daughter Rendong, who was being taken into the Gu family as the only heir.
The son of the famous doctor Gu Feng in Qingyuantang pharmacy was accidentally drowned and Gu Feng's mother blamed his death on their butler, Fang Cheng. Fang Cheng felt grudged, as his bastard Qiang Wei with his mistress named He Xiu has nowhere to foster her.