Episode 4 recap: Song Zhuowen shifts the blame to Tian Xiao Jiang.

When Guan Xue saw a woman holding a child, she immediately called Pan Yue to arrest Tian Xiao Jiang for interrogation. Taking advantage of the chaos, Song Zhuowen escorted Mrs. Shi and the child away. Everyone was questioned, and Song Zhuowen intentionally directed suspicion towards Tian Xiao Jiang. However, Tian Xiao Jiang had only helped a woman pick up her wallet and did not let her go.

In the end, Tian Xiao Jiang shouted that he knew who the real woman in labor was, and the evidence was a pen. It was highly likely that Song Zhuowen had killed Du Bian, and the tip of his pen had been recently replaced. That night, Tian Xiao Jiang secretly stole Song Zhuowen's pen. When Song Zhuowen was brought in for questioning and encountered Tian Xiao Jiang, they angrily fought each other, with Song Zhuowen threatening him.

Song Zhuowen admitted that the pen was his own and that he couldn't find it yesterday. Guan Xue asked if Song Zhuowen had replaced the pen tip and where he had done so, and Song Zhuowen truthfully revealed the details. Guan Xue and Pan Yue went to the shop to investigate, but the other party's answers were seamless, and they even had detailed records. After Pan Yue's investigation found no issues, Guan Xue asked him to bring Song Zhuowen over.

Song Zhuowen relieved himself of suspicion and felt secretly delighted. Fortunately, he had taken care of the pen long ago, so even if it was investigated, there would be no flaws. Song Zhuowen was invited to the home of Guan Xue and Guan Kai, where Guan Xue personally cooked. Song Zhuowen was surprised to see this gentle side of Guan Xue, who usually appeared fierce and ruthless.

Although today's incident had been clarified, Guan Xue still tested him with every sentence, and Song Zhuowen calmly dealt with it.

Guan Xue prepared a table full of dishes and said she wanted to find Song Zhuowen's younger brother so that the whole family would be together. Suddenly, Guan Xue's phone rang, and she went to answer the call. Song Zhuowen chatted with Guan Kai while Guan Xue and Guan Kai got into an argument. Song Zhuowen didn't react much and continued eating. However, Guan Xue noticed that he hadn't touched the sweet and sour pork placed in front of him. Could a person's appetite change too?

Guan Xue arranged accommodation for Song Zhuowen, which belonged to one of her Japanese friends. She also arranged for Aunt Chang to take care of his daily life. However, Song Zhuowen was well aware that it was all a test. Guan Xue asked Song Zhuowen to visit Aunt Shi, who was a doctor. The leads from the hospital side had surely been cut off, so there was no need to continue the interrogation. Speaking of Hu Bin, Guan Xue told Song Zhuowen that he didn't need to save face for her next time and should teach him a lesson. The path to the Special Operations Division was also smooth now.

During Song Zhuowen's interrogation of Doctor Shi, Guan Xue was listening in. Doctor Shi cleverly helped him gain trust and pass on information. When Song Zhuowen brought something for Guan Xue, someone came to deliver a secret message. In front of Song Zhuowen, Guan Xue slapped the person hard three times. Since it was a secret message, why didn't she go around shouting it to the world? Guan Xue asked Song Zhuowen to keep an eye on Pan Yue and Hu Bin while granting him the highest level of authority.

In fact, the content of the secret message was that there was a mole. Song Zhuowen was sent to procure items and took the opportunity to win people's hearts. Xiao Wu woke up and mentioned the man in the checkered suit who shot himself. Pan Yue hinted several times that he wanted Xiao Wu to change his statement but was unsuccessful. At this moment, Song Zhuowen was also searching for the man in the checkered suit.