Su Qingci, a person who time-travels from the modern era, becomes the eldest daughter-in-law of a marquis manor who is fated to a tragic fate. Faced with persecution from the biased head of the manor and schemes of the concubine-born sister-in-law, she relies on her professional forensic skills. She finds clues to unsolved cases, exposes hypocrisy, uncovers secrets hidden by the marquis manor, brings wrongdoers to justice, and lives a magnanimous life.