Modern forensic pathologist Lin Wan unexpectedly transmigrates into ancient times, becoming Shen Yuan, a concubine-born daughter whom her family is about to drown in a pond for “unchastity.” The original owner's memories are jumbled, leaving behind only scattered fragments. At a critical moment, Lin Wan uses her forensic expertise and clear head to point out flaws in the evidence, saving her life for now, though her circumstances remain dire.