Episode 6 recap: Tan Jing Tian checked into a poor household.

Liu Xiao Yu's memorial service was held as scheduled, and his friends all attended. Li Guo was very sad, even though Professor Liu Xiao Yu's previous project had made great progress. She and Professor Tang also decided to return to their home country the next day to handle the project-related matters, but she was not happy. Jin Ling comforted Li Guo.

Tan Jing Tian will also follow Professor Tang back to their home country, so his accommodation for that night in Thailand became a problem. His dorm was sealed off by the police, and he could not go back. Jin Ling suggested that he agree to stay at the poor household, and after Jin Ling persistently persuaded him, Tan Jing Tian reluctantly agreed.

Tan Jing Tian hesitated because he was concerned that his "dangerous" constitution would cause trouble for others. De investigated the perfume that Tan Jing Tian had given to Gira Yu. That perfume was a homemade one with many fruit ingredients, but strangely, it did not contain any alcohol to fix the fragrance. This meant that if Gira Yu sprayed the perfume, the ants would get very excited upon smelling it.

Therefore, De believed that this was the way Liu Xiao Yu and Tan Jing Tian conspired to kill Gira Yu. However, Cha did not think so, because the appearance of the gecko in Gira Yu's room was not a coincidence. Therefore, just based on a bottle of perfume, it could not be determined that Tan Jing Tian and Liu Xiao Yu conspired to commit murder.

The most important point is that Tan Jing Tian had synchronized the information about the ants and the gecko to them, otherwise they would not have known about these things. Therefore, he believed that Tan Jing Tian could not be the perpetrator. Tan Jing Tian and Jin Ling went to the police station to find Cha and told him that they would be returning to their home country soon, which made De very angry, as he still had doubts about Tan Jing Tian.

Cha analyzed the people who had motives to commit the crime against Gira Yu. No matter how De argued, he just believed in Tan Jing Tian, but he had little contact with Liu Xiao Yu, so he maintained a suspicious attitude. However, in the case of Gira Yu's murder, he believed that there were still people who were strangers or acquaintances who committed the crime, so Cha sent people to investigate Gira Yu's social relationships.

Because Liu Xiao Yu and Tan Jing Tian both have the habit of not locking their doors when they sleep, and Liu Xiao Yu takes medication at 11 pm every night before going to bed, and Tan Jing Tian also takes medication and wears headphones, even if there were sounds, they would not hear them.

However, being able to move the ants in Liu Xiao Yu's room to Gira Yu's room and then leave undetected, it is very likely that the perpetrator is someone familiar with Liu Xiao Yu. This involves insects, which means it is likely Professor Tang. But a renowned international entomologist professor and a landlord really have no connection, so how could he go to such lengths to commit murder? Tan Jing Tian thinks that if they suspect Professor Tang, that would be even more ridiculous than suspecting Liu Xiao Yu, since Liu Xiao Yu had a conflict with Gira Yu, but Professor Tang has no relationship with Gira Yu.

De has always been hostile towards Tan Jing Tian. Tan Jing Tian says he will help them find Gira Yu's killer, but De thinks he is just helping himself. Cha tries to comfort De, saying that Tan Jing Tian living in his own home also has an advantage, in that if something happens, De will have a reason to arrest Tan Jing Tian. De is very speechless about this.

Cha sent the phone number of Professor Tang that Tan Jing Tian provided to De, asking him to check if that number was in contact with Gira Yu or Liu Xiao Yu on the night of the incident. In the evening, Cha and De went to visit Professor Tang and Li Guo, as part of the investigation process, Cha needs to understand the situation from Professor Tang.

In the conversation, Li Guo mentioned the conflict between Professor Tang and Liu Xiao Yu, which caught Cha's attention. Cha hopes Professor Tang himself can talk about the conflict with Liu Xiao Yu. Actually, Li Guo helped Professor Tang conceal the fact that he was not home on the night of the incident, as Professor Tang had gone to the lab that night, but no one saw him. They are about to return to Thailand, and Li Guo does not want to create more trouble. He wants to get the matter resolved first, then they can find an opportunity to explain to the police later, otherwise the police investigation will affect them.