Modern criminal policewoman Lin Mo accidentally discovered a secret letter from the Republic of China while investigating a bizarre disappearance. A mysterious incident that followed brought her back to Shanghai a hundred years ago. In that era full of turmoil and mystery, she met the handsome detective Gu Yan, and the two bonded over their shared mystery. Behind the layers of doubts, there is actually a huge conspiracy that affects time and space. During the process of jointly investigating the case, Lin Mo and Gu Yan's emotions quietly grew, but they were full of regrets and struggles due to time and space barriers. As the truth was gradually revealed, Lin Mo discovered that his and Gu Yan's fate had been controlled by a mysterious organization a hundred years ago. She must make a choice between love and justice, find a way back to modern times, and protect Gu Yan's future. In the rhythm of suspenseful reasoning, the love between Lin Mo and Gu Yan spans time and space. How they finally break free from the shackles of fate and uncover all the mysteries becomes the biggest suspense of the story.
