Yan Jin, a modern female forensic doctor, encountered an explosion while investigating a serial murder case. When she woke up, she found that she had traveled back in time to the ancient Zhou Dynasty and became the eldest daughter of the Yan family who was wrongfully accused of killing the prince. She was facing the desperate situation of being executed late. With his professional forensic knowledge, he discovered the true cause of the prince's death, which bought him time to investigate the case, and also attracted the attention of Shen Yi, the Minister of Punishment. As they work together, feelings gradually develop.
After the two cooperated, they discovered the secrets of their own lives. The fateful trajectories of the two time and space both overlapped and extended separately. In two time and space, they are each other but not each other, and each has its own story happening.
In the long river of time and space, they are like twin stars. Although they belong to different horizons, they always believe in light and engrave the mark of firm companionship on each other's destiny.
