Modern forensic doctor Su Qingyuan encountered a landslide and was scratched by fragments of an ancient mirror while investigating the tomb of a Song Dynasty general. When she woke up, she traveled to the Dajing Dynasty, which was similar to the Song Dynasty, and became the daughter of a guilty minister. By coincidence, she relied on her forensic knowledge to solve an "accidental death" case, which attracted the attention of Xiao Jue, the unjustly imprisoned General of Zhenbei. At that time, Xiao Jue was waiting to be executed for "collaborating with the enemy and treason." His confidants secretly turned to Su Qingyuan, hoping to use her "special ability" to find evidence to reverse the case. The two went from being suspicious of each other to working side by side. Su Qingyuan used modern forensic techniques (such as autopsy, toxicological analysis, and on-site reconstruction) to solve the serial murder cases, while Xiao Jue used strategy and force to protect her. During the process, they discovered that many cases were related to the "collaboration case" in which Xiao Jue was framed, and that behind them were the royal secrets and the mysterious organization "Shadow Pavilion". What's even more bizarre is that the ancient mirror fragments that Su Qingyuan carries with her can actually allow her to see Xiao Jue's past under certain conditions, and also allow Xiao Jue to occasionally perceive her modern memories. As the clues deepen, the two not only have to fight against the traitors in the court and the pursuit of the "Shadow Pavilion", but also uncover the truth about time travel - the secret of dual time and space energy exchange is hidden behind the ancient mirror, and their fates have been bound thousands of years ago. In the end, Su Qingyuan helped Xiao Jue clear her grievances and uncovered the mastermind behind the scenes. However, she was faced with the choice between "staying in ancient times" and "returning to modern times", and Xiao Jue was willing to give up power for her and explore the possibility of staying together across time and space.
