Episode 25 recap: Dong Gang confessed to the fact that he committed the murder.

Late at night, Dong Gang came out of the store carrying a bag and sneaked away. Ma Kui and Wang Xin saw him and immediately followed him. Dong Gang wandered through the streets and alleys, finally ending up at a small house. After spending some time inside, he came out again. Ma Kui realized that Dong Gang was a criminal and had strong anti-detection capabilities. They found it difficult to track Dong Gang and discover anything.

After Dong Gang left, Ma Kui asked Wang Xin to stay in place while he followed Dong Gang. Wang Xin, thinking that he was faster, suggested that Ma Kui stay behind and he would follow Dong Gang. After Dong Gang returned home, Wang Xin would go through the trash he left behind.

Wang Xin looked through the trash and found leftover food and household waste, leading him to believe that someone was hiding in the small house. With this deduction, Ma Kui decided to check the situation at the small house and indeed found a locked-up person inside, but it wasn't Ding Gui'an, and the person seemed confused.

The person in the small house was not Ding Gui'an, so Ma Kui and the others went to the store to arrest Dong Gang. However, Dong Gang had already escaped, leaving Wang Xin puzzled about how Dong Gang had discovered him and managed to escape first.

Ma Kui and Wang Xin went to the police station to gather information and learned that the locked-up person was Dong Gang's brother, who suffered from severe mental illness. They had no leads to find Dong Gang. Wang Xin believed that Dong Gang's brother could be a lead, so he arranged for police forces to be stationed at the hospital while he himself went to investigate Dong Gang's brother's condition.

Wang Xin had a conversation with Dong Gang's brother and noticed that he wanted to eat fish. So he took him to a restaurant to have some fish. Just as Dong Gang's brother was about to eat, a police officer in uniform walked in, causing him to scream, "I didn't kill anyone!" This made Wang Xin think that perhaps he witnessed Dong Gang committing the murder and was traumatized, leading to his mental illness.

Wang Xin became convinced of Dong Gang's suspicion of murder. At this time, someone discovered new body parts, and there was a character "义" (justice) similar to Ding Gui'an's on the body parts, making the case even more complicated. While Ma Kui and Wang Xin were analyzing the body parts, they learned that Dong Gang had been captured. They went to interrogate Dong Gang.

Upon learning that his brother had revealed the truth, Dong Gang could only confess. He admitted to killing someone five years ago, and his brother happened to witness it, which led to his brother developing a mental illness and constantly claiming that Dong Gang didn't commit the murder. That's why he locked his brother up. Dong Gang admitted to the fact of committing the murder but claimed not to know where Ding Gui'an was. Ma Kui and the others also believed that Ding Gui'an's disappearance might not be related to Dong Gang.

Jia Jin Long came to Wang Xin's house with a generous gift, but to his surprise, Wang Xin wasn't home. He lingered in the courtyard, hoping to run into Yao Yu Ling, but she didn't appear. Eventually, Jia Jin Long encountered Yao Yu Ling when she returned. He returned the button he had found last time to Yao Yu Ling and took the opportunity to get to know her.

Ma Yan secretly hid some dumplings and asked Peng Yong Li and Ma Jian to deliver them to Wang Xin. However, Ma Kui had already discovered it and replaced the dumplings with dough. When Wang Xin received the dumplings, he happily prepared to cook them, only to realize that they were all dough. He had to remake the dumplings with Wang Yong Ge, but he couldn't understand why Ma Kui didn't think highly of him.

Ma Yan noticed that the dumplings had been switched back and confronted Ma Kui about why he looked down on Wang Xin. They had a big argument, and Ma Yan declared that no matter how much Ma Kui opposed it, she would still be with Wang Xin. There were more than ten cases of pickpocketing on the train, causing concern among the police. Captain Jiang convened a meeting to discuss the severity of the cases and how to solve them.

Ma Kui and Wang Xin contemplated the case and remained vigilant while on duty. Unexpectedly, Wang Xin encountered Xiao Wen Zhou, who had restarted his business. Xiao Wen Zhou was grateful for Wang Xin's previous help, which allowed him to resume his business. They had a private conversation about business matters, and Xiao Wen Zhou gave Wang Xin some delicious food.

When Lao Xia Zi got off the train at the Haipo River, he inadvertently caught a scent from a girl that resembled his lost daughter, Duo Er. He followed the girl and asked her questions persistently. Ma Kui saw how sad and distressed Lao Xia Zi was, so he chatted with him for a while to comfort him.

Wang Xin brought the delicious food back to Ma Yan, who became interested in business. She asked Wang Xin for Xiao Wen Zhou's contact information because she wanted to learn from him. Jia Jin Long finally met Wang Xin and Ma Kui, and they had a meal together, catching up and expressing gratitude for their help in buying train tickets.

After the meal, Jia Jin Long left Wang Xin's house but still had Yao Yu Ling on his mind. He wanted to see her but hadn't been able to meet her. Niu Da Li knew that Yao Yu Ling wanted a cassette recorder, but he couldn't afford one. He could only learn and tinker with electronics with the help of a master from an appliance store.

Yao Yu Ling loved buying beautiful clothes and dressing up. Niu Da Li saw her wearing nice clothes again and struck up a conversation, hoping to encourage her to be more thrifty. However, he ended up being ridiculed by Yao Yu Ling, leaving her displeased.

Ma Yan lied about attending a classmate's wedding and went to Harbin alone to find Xiao Wen Zhou. Meanwhile, Ma Kui forgot to bring his keys and couldn't go home. He suspected Ma Yan's whereabouts and went to Wang Xin to inquire about it.