When a sudden mountain flood strikes, fishmonger Lin Wanqiu risks her life to rescue the head of the Cheng family. The crescent-shaped birthmark on her arm reveals the truth about the babies switched at birth twenty years ago! She politely declines the Cheng family's offer of two million yuan and a luxury mansion, choosing instead to join Shenghetang, a century-old braised food business, as a quality control apprentice. Fearing her true identity, the fake heiress conspires with the housekeeper to frame her and forge appraisal evidence. Zhao Ting gathers conclusive DNA evidence from three independent sources, ultimately uncovering the entire truth and ensuring that those responsible face legal consequences, while helping her reclaim everything that rightfully belongs to her.