In the first volume, "Haiyan Heqing", the anti-drug policemen worked together to solve the case in college, but they had a bumpy fate and finally separated; in the second volume, "Sin City: City A", it was just a momentary kindness that was exchanged for eternal destruction. Family ties were separated forever, friendships were broken, and love went to hell; in the third volume, "Prisoned Hearts", the two people who maintained a superficial marriage, old cases from previous years surfaced, and they hated the sea...
