It turned out that, due to the importance of the current lighthouse case, in the process of investigating, the policemen were only assigned different tasks, but could not fully know all of the investigation's information. Moreover, although the local people knew about the lighthouse murder case from decades ago, they were not familiar with the name Liu Caiyun.
Therefore, when Zhao Yu claimed that Captain Dou's mother was Liu Caiyun, some of the policemen were at a loss for who he was talking about. After Zeng Ke understood this, he introduced the old lighthouse case to several of the policemen present. When they learned that Liu Caiyun was the wife of the lighthouse keeper, their faces all filled with surprise.
An elderly policeman, who recalled the old lighthouse case clearly, after listening to Zeng Ke's explanation, looked at Captain Dou and asked in shock, "Captain Dou, is this true? Your mother is... Liu Caiyun!? And you are..."
