Seo Eun was forced to leave the army after the Kim No-ri incident. She deeply felt that she could not reach a situation like Goo Ja-woon.Before leaving, she secretly handed some confidential information to Park Ji-seop, hoping he could use it to reveal the truth.Park Beom-gu, through Heo Ji-young, handed over these materials to private operators for processing.

At this time, Ju Ziyun was being interviewed by the TV station. He firmly opposed the public and media's criticism and distorted reports of the military court.He found Park Beom-gu and Park Ji-seop and asked them to investigate a case involving Na Zhongshuo.Luo Zhongshuo died while trying to rescue a soldier who accidentally stepped on a landmine, but his relatives and friends questioned the authenticity of the investigation results.The case received renewed attention after the Human Rights Commission proposed reinvestigating the case.

Park Ji-seop supports re-investigating the case because the bomb disposal team believes that the old landmines used at the time could not have caused injuries like Na Zhongshuo.Gu Ziyun seemed to intend to hand over the case to Park Ji-seop, who had lost his friend. Park Beom-gu was asked by the captain to take over the case.Park Ji-seop realized that this was Goo Ja-woon's provocation, because Na Zhongshuo had called him the night before his death and seemed to have something unsolved.Park Ji-seop regretted not listening to his call carefully.

The biggest controversial point in this case is that Private Shen Nhahai did not provide an alibi.An Junhao, who was brought in for investigation, knew nothing about the darkness and isolation of the border post.Park Ji-seop emphasized that the people at the outpost were hiding something, but the outside world knew nothing about it.Upon arriving at the outpost, director Xu Taishan took them to the surveillance area.Park Ji-seop was eager to know the location of Na Zhongshuo's crime. On the night of the incident, Luo Zhongshuo tried to dismantle the landmine that Shin Yahui stepped on, but the mine still exploded a few seconds later. Only Nao Zhongshuo died, but Shin Yahui was unscathed.Shen Yahui was the latest witness, but he remained silent about the incident.

Park Ji-seop believes that the case is not simple because the superiors rushed to close the case without serious investigation.He didn't know why, but the border post had its own little world, and the outside world couldn't understand the truth.After checking the report, Park Beom-gu found that a soldier had been contradicting his superiors, so he decided to transfer one of them to other units.This cadre is Luo Zhongshuo and the soldier is Shen Yahui. The relationship between the two is not good.Park Ji-seop suspected that Shin Ah-hwa deliberately had a quarrel with Na Zhongshuo in the mine area, causing Na Zhongshuo to step on the landmine.

Oh Min-woo found Park Beom-gu and asked him to hand over the flash drive, and even threatened him.Wu Minyu admitted frankly that the disc contains the top secrets of the national army and fraud.He asked Park Bum-Koo not to act rashly for the sake of his family, and also revealed that sending Park Ji-sub to the border post this time was intentional because the director had already made a plan.Park Fangu was shocked to realize that he was being used.Gu Ziyun knew that Park Ji-seop could easily lose control of his emotions, so he deliberately sent him to investigate the case in order to obtain evidence that he lost control and hit others to restrain him.In this way, they can close the case on the grounds that it is no different from the original investigation results and explain it to the public and the Human Rights Commission.

Park Ji-seop tried to get evidence from Shin Ah-hui, but Shin Ah-hui was very afraid of fire because he had experienced a “barbecue incident” and left psychological trauma.In fact, Shen Yahui was telling the truth. Luo Zhongshuo was the culprit who caused chaos in military discipline. He verbally bullied his subordinates.On the night of the incident, he was venting his hatred towards Shen Yahui and telling the story of the dog hole. Shen Yahui pushed him in order to resist, and Luo Zhongshuo accidentally stepped on a landmine and died.Shen Yahui was afraid that telling the truth would lead to a military court, so she was very tormented.Everyone agreed not to reveal the truth in order to cover up this fact.But since then, Shen Yahui's temper has become as violent as Luo Zhongshuo's.

Park Ji-seop could not accept this fact, and Goo Ja-yun forced him to maintain the original investigation results.Otherwise, the pensions received by Luo Zhongshuo’s family will be withdrawn.At this time, Wu Minyu told Park Fangu that the design was to let them know that nothing could be changed even if they knew the truth.Park Fangu accidentally took over a toy box from Wu Minyu, which contained a large sum of money. Wu Minyu wanted to use this evidence to suppress Park Fangu.When Ahn Jun-ho went to get the processed flash drive, he suddenly saw the news on the news. Shin Hye-yeon of the Human Rights Center accused the state of being an accomplice and accomplice in the Kim No-ri incident. She hoped that someone could provide clues and come forward.However, Ahn Junho did not return to the army at the designated time.