After a series of investigations and adventures, Eren and the mysterious woman managed to recover the bioweapon from the Shadow Order. They knew that this was only the first step in uncovering the truth about the Shadow Order, and that there was still a lot of work to be done. In the process, Eren builds a deep trust with the mysterious woman, who tells Eren that her name is Sophie.

Back at Allen's Bureau of Investigation, the two decide to analyze the recovered biological and chemical weapons, as well as the materials they had previously downloaded from the Shadow Order's secret base. Alan began to conduct detailed research on the materials, trying to find out the core members of the Shadow Order. He discovers that the Shadow Order is actually a vast criminal network with a global sphere of influence. There is a strict hierarchy within the organization, and the core members are very secretive, and even the average members rarely know about their existence.

Alan couldn't help but be shocked by the sheer size and tight organization of the Shadow Order. He knew that in order to completely destroy this criminal group, he had to start from the top and find out who was behind the control of the Shadow Organization. Sophie also realizes the seriousness of the problem, and she decides to help Alan track down these core members together.

After several days of searching and analysis, Alan uncovered a key clue. During a secret deal with the Shadow Order, they found an important trader who seemed to know something about the core members of the Shadow Order. Alan and Sophie decide to follow the trader in the hope of getting more information from him.

They cautiously followed the trader and, after a few days, finally found him in a box at a luxury hotel. Alan and Sophie sneak into the box and subdue the trader when he is unprepared. During the interrogation, the trader finally revealed some information about the core members of the Shadow Order. He reveals that the leader of the Shadow Order, also known as the Shadow Lord, is actually a wealthy merchant named Jackson. This man appears to be a serious business person, but in reality he controls the world's largest criminal network. Jackson has been secretly manipulating the Shadow Order, not only related to Wisteria, but also involved in a range of other criminal activities, including illegal arms trading, kidnapping, drug trafficking, etc. Alan and Sophie know that in order to completely destroy the Shadow Order, they must arrest Jackson.

To ensure the success of the operation, Alan and Sophie orchestrate a plan. Through a series of informants and investigations, they first found Jackson's residence. After that, the two sneaked into Jackson's villa late one night. In the villa, they found a hidden basement. In the basement, Jackson kept a large number of documents and materials about the Shadow Order, confirming his identity as the Shadow Lord. In addition, they discover a startling secret: Jackson is planning an even more horrific attack, targeting important cities around the world.

Alan and Sophie acted immediately and decided to bring Jackson to justice before he carried out this terrorist attack. In a pitched battle, Alan and Sophie managed to subdue Jackson and hand him over to the police. The police interrogated Jackson and obtained a lot of information about the Shadow Organization from him. Guided by this information, the police launched a global operation, successfully destroying many of the Shadow Order's key bases and arresting a large number of core members.

During this time, Alan and Sophie continue to gather other clues in an attempt to clear the case. They discovered that Jackson's men were also plotting to use the poison of wisteria to create a new type of biological weapon for use in terrorist attacks around the world. Through the efforts of Alan and Sophie, the plot is finally crushed and peace is restored to the world.

The fall of the Shadow Order and the arrest of Jackson have filled the world with respect for Alan and Sophie. As a result, their bureau of investigation became famous and received a lot of attention. However, Alan and Sophie didn't let that stop. They know that the evil in the world still exists, and that the mission of the Night Investigation Bureau needs to continue. The two decide to continue working together to track down more criminal cases and bring to justice those who are hiding in the dark.

In the process, Alan and Sophie develop a deeper bond. Sophie revealed that she chose to join the Night Investigation Bureau because her family had been persecuted by the Shadow Order. She hopes that through her own efforts, she can get justice for her family. Alan was deeply moved, and the relationship between the two became closer.