Behind every crime there is a story.
It may be hate, it may be love, it may be forced, it may be helpless.
But the cause of every crime is the real original sin.
What was brought to Yuan Zheng, Lao Han, and Lin Shan 5 years ago was indelible pain.
Five years later, how will the newly promoted police officer Ding Fei change their destiny, and what kind of cases will they encounter?