How did the death of Wang Chongjiang in "The Returning Daughter" surface?

The daughter who came back Overall score 2022 /

Someone caught Wang Chongjiang's eldest brother while fishing by the river, only to find out that Wang Chongjiang had been killed. The police found the car that had sunk into the river and found Wang Chongjiang's body in the trunk. Li Chengtian thought that by pushing Wang Chongjiang's car into the river, he could cover up the murder, but the Skynet did not miss it. When a group of fishing uncles were fishing by the river, they caught a big brother. At that time, in this small county, few people could use a big brother, so they chose to call the police.

Later, the police found Wang Chongjiang's body and found that he had been stabbed in the abdomen, and listed the incident as a murder. Based on Wang Chongjiang's call records, the police found that the last person who contacted him was Liao Suifang, and then the police questioned Liao Suifang. Knowing that at two o'clock that night when the incident happened, Liao Suifang did call Wang Chongjiang, but after the call was connected, the other party did not respond. She had heard the sound of knocking on the phone. Because this knocking sound is enough to prove that Wang Chongjiang was not dead when he was pushed into the river.