"Lancheng", an old industrial city near the sea in the south, is shrouded in salty mist and industrial dust all year round. The old port area and the new urban area are clearly separated, and smuggling, old cases and family secrets are hidden. Su Wan returned to Lancheng from other places. Her brother Su Zhe had been missing for three months. The police determined that he had left home voluntarily. However, she found an encrypted notebook and an old anchor pendant left behind by her brother.
