When Yidang went to the supermarket to hand over the goods, he saw the clerk Zheng Enshang being made difficult by unreasonable customers. Then he met the same customer Li Guangxun. Another man Jin Mingzhen helped to rescue him. Before returning home, Yidang borrowed a hammer from the store manager., found Guangxun sleeping on the ground, and reminded Mingzhen, but Mingzhen asked Yidang to leave him alone and beat him. Yidang remembered the scene when he and Jinghuan were bullied by Park Ki-hoon and others in high school, and took out the hammer from his bag.Fighting back, it suddenly started to rain. Mingzhen got up and fell down again. Xuan Ruyu passed by with a guide dog, and Yidang ran home in fright.

Jinghuan comes to find Yidang, but Yidang forgets to take the hammer when he remembers it.The next morning, Interpol Zhang Nankan went to the scene to investigate and found two bodies. The store manager called and asked Yidang to go early. Two young men borrowed lighters from Nankan in front of the convenience store. They thought Nankan was rude, so Nankan took them away.Back to the police station, after watching the supermarket surveillance footage, I ran to ask the store manager about Yidang. Yidang happened to come to work, so I couldn’t ask what the two talked about. Yidang said it was about family, and the otherThe criminal police said that fingerprints and witnesses confirmed that the two men beat each other to death.

It turns out that Guangxun's wife had an affair with Mingzhen and planned to wait until their son grew up before divorcing.Jinghuan came to Yidang and said that the police had asked him and Meiying about Yidang.The next day's news reported that Kim Myung-jin was the murderer of the 2009 Gangwon-do serial murder case, Yeo Bo-ri, and Yi-dang's hammer was picked up by Ru-yu.