Episode 19 recap: Song Zhuo Wen changed medicine, and Pan Yue fell ill.

Song Zhuo Wen and Pan Yue informed Guan Xue that the suspect had been found. It was Guan Kai. When he visited the injured, he brought some food, including dried apricots, which could effectively mask the smell of explosives. Guan Xue decided to step back and let Pan Yue handle the interrogation. Pan Yue suggested that Song Zhuo Wen conduct the questioning while he took care of the record-keeping. Guan Xue didn't interfere with their division of labor.

Song Zhuo Wen asked Guan Kai what he had done at the hospital yesterday. Guan Kai had obviously prepared his alibi, and Song Zhuo Wen could only secretly assist Guan Kai. Regardless of whether what Guan Kai said was true or not, they had to investigate it. Song Zhuo Wen and Pan Yue planned to split up and investigate.

When Pan Yue went to report the case to Guan Xue, he was sweating profusely. Guan Xue's attitude suddenly became gentle, but Pan Yue's mood suddenly turned sour. He forced himself to say that he would write an investigation report for Guan Xue and Chief Qian to review. Pan Yue wanted to mention that they had missed a witness in the Cui Anping case, but at that moment, Song Zhuo Wen pushed the door open and interrupted their conversation.

Song Zhuo Wen was going to pick up Guan Kai and take him home. Guan Xue instructed him not to say anything on the way, just to send Guan Kai home directly. Guan Kai asked Song Zhuo Wen if he had many friends in Harbin, many like-minded friends. Song Zhuo Wen told him not to mind what others say, but to observe their actions.

Finally, Guan Kai asked what should be done if harming people around oneself was necessary to achieve an ideal. Song Zhuo Wen didn't answer directly but said that he wouldn't harm any innocent person. When Guan Kai returned home, he met Guan Xue. Guan Xue couldn't understand why Guan Kai wanted to take his own life. On the day in the car, Guan Kai had clearly known that they would die together.

Director Jin arrived, and they planned to send Guan Kai to Japan. In this situation, Guan Xue had to protect Guan Kai. The one who instigated Guan Kai was the Military Statistics Bureau (军统). Song Zhuo Wen cursed vehemently in front of Guan Xue, and in reality, Guan Xue was also worried about sending Guan Kai to Japan, but he could only watch over him himself.

Pan Yue worked overtime all night and went to work after staying up all night. However, he discovered that the office door lock was broken, and he went crazy, almost kicking the door down. Guan Xue remained calm and asked Pan Yue to tidy up before meeting Chief Qian together. On the way, Guan Xue asked Pan Yue what had happened. If he wasn't in a good state today, it might be better not to meet Chief Qian. However, Pan Yue said he could handle it.

But when Pan Yue met Chief Qian, the documents in his bag were missing. Pan Yue's emotions almost collapsed. He had checked them before leaving! Chief Qian asked Pan Yue to explain to them, but Pan Yue, contrary to his usual calm demeanor, started speaking stutteringly, and the images in his mind became more and more chaotic.

Song Zhuo Wen went to Pan Yue's office and secretly replaced his medicine. When he left, he wiped off his fingerprints from the doorknob. After returning from Chief Qian's office, Guan Xue remained silent and went back to the office. Song Zhuo Wen could tell that today was definitely not going well.

Pan Yue was in a very bad state today and even implicated Guan Kai, which naturally angered Guan Xue. After work, Guan Xue hid in the nightclub again, unsure whether to abandon Pan Yue or Song Zhuo Wen. She only wanted to protect her younger brother. In the evening, when Pan Yue had dinner with Hu Bin, he trembled all over while discussing the matter due to his own mistake.

Song Zhuo Wen went to see Chief Qian, saying that it was Pan Yue who asked him to come and apologize for the events of the day. Song Zhuo Wen also brought Guan Kai's transcript to clear his suspicion.