Police are investigating a lie detector against his brother Kim (27), who is alleged to have assisted the murder of Kim Sung-soo (29), a PC case murder case.

A police officer in Seoul's Gangseo police station is investigating the case, saying, "My brother Kim agreed to investigate the police's lie detector." He is currently coordinating his schedule and will investigate suspected complaints against his brother. "

Police said that his brother was not in possession of an accomplice.

A lie detector is a device that detects the body changes that can appear when you lie and determines if you are lying.

In consideration of the characteristics of the inspection and human rights issues, the prior consent of the examinee is essential.

The test results are used as reference materials during the investigation and have no legal proof.

Police are planning to investigate whether a brother has been involved in a crime with his brother through a lie detector test.

At first, this incident seemed to be a simple and accidental murder, but there was a controversy arising from an article pointing out the weak response of the police centered on the online community.

Particularly, a press has raised some controversy after releasing a part of the video clips of CC and raising suspicion that Kim's sister helped him with the murder of his part-time student.

It is difficult to say that the younger brother conspired or assisted the crime when the police examined the whole CCTV screen and witness statements together.

However, the police are working on digital forensics for Brother Kim's cell phone to clarify the part of the allegation.

To see if there are any deleted messages on your phone and to find out whether you are open call.

Evidence analysis is also under way to improve the quality of the CCTV images, which are shot before and after the crime.