Xu Yuehuai took a deep breath, trying to calm her anger and unease. She knew there must be a deeper secret hidden behind this matter. She decided to investigate it herself and uncover the truth.

She turned to look at Tie Xiong and Yan Qing, her eyes filled with determination and conviction.

“We can’t give up like this; we must get to the bottom of this.” Her voice was firm and powerful, filled with an unwavering determination.

"yes!"

Tie Xiong and Yan Qing looked at her, their eyes also shining with determination. They knew that Xu Yuehuai was a resilient and decisive person; no matter what difficulties or challenges she faced, she would not give up easily. They were willing to follow her, to investigate to the end, and to uncover the truth behind it all.

As night deepened, Xu Yuehuai stood in the moonlight, her figure appearing lonely yet resolute. She knew this investigation would be fraught with hardship and danger, but she was prepared.

She believed that she and her companions would be able to uncover the truth and expose the forces lurking in the shadows.

Over the next few days, Xu Yuehuai, like a persistent hunting dog, personally delved into the quagmire of the incident, attempting to uncover the true identity of the man in black.

Her eyes were sharp and resolute, as if they could see into people's hearts. On this day, she went deep into the city and personally investigated the identities of the deceased men in black.

On this day, she arrived at an ordinary family's home in the capital and gently knocked on the door. When the door opened, a middle-aged woman with a weathered face appeared before her.

Xu Yuehua smiled and nodded at her, then asked softly, "Are you a family member of Liu Cheng?"

The middle-aged woman paused for a moment, then nodded, tears welling in her eyes. She invited Xu Yuehuai into the house and sat him down at a worn-out table. Xu Yuehuai looked at her face and saw that her eyes were filled with endless sorrow and pain.

"Can you tell me when your family member went missing?" Xu Yuehuai asked gently.

The middle-aged woman choked up as she recounted what had happened in Liucheng recently. She said that he had suddenly disappeared one night without any clues being found, and many other people in the surrounding area had also mysteriously vanished without a trace.

They reported the matter to the imperial court, but the court has been unable to find the whereabouts of those people ever since.

Now everyone has lost hope and believes that their loved ones must have been murdered.

Xu Yuehuai listened silently, her eyes shining with determination. She knew that there must be a secret hidden behind the identities of these men in black.

Next, Xu Yuehuai began questioning the middle-aged woman about her relatives. She asked very detailed questions, from their daily lives in Liucheng to their whereabouts.

The middle-aged woman was very cooperative, answering Xu Yuehuai's questions in detail, as if she had found someone to confide in.

Xu Yuehuai spoke softly, her voice filled with sympathy and determination: "Madam, please tell me, did he exhibit any unusual behavior before he disappeared?"

The middle-aged woman looked up, her eyes red and swollen, tears welling in them. Her voice trembled as she said, "Yes, yes. He always leaves mysteriously at night, and always comes back in a hurry, as if something important is waiting for him. When I ask him where he's been, he always stammers and won't tell me."

Xu Yuehuai frowned, her fingers tapping lightly on the table as if she were calculating something. She continued, "Did he mention any strange people or things?"

The middle-aged woman thought for a moment, then suddenly said, "Yes, yes, once I overheard him muttering something like 'the secret of the capital' and 'a mission for humanity' in his room. I didn't pay much attention at the time, but now that I think about it, those words seem to have some special meaning."

Xu Yuehuai's eyes lit up; she felt she was one step closer to the truth. She took a deep breath, trying to make her voice sound calm: "Madam, thank you for telling me this. These clues are very important to me. I will definitely investigate to the end and seek justice for your husband."

Looking into Xu Yuehuai's determined eyes, the middle-aged woman seemed to see a glimmer of hope.

A slight, bitter smile appeared on her lips: "Girl, I believe you. You must find the truth and bring my husband back!"

Xu Yuehuai stood up, her eyes filled with determination. She knew this path would be fraught with hardship and danger, but she was prepared. She grasped the middle-aged woman's hand tightly and said firmly, "I will, madam. Please rest assured."

As Xu Yuehuai left the room, her heart was filled with doubt and anger. She understood that these men in black were not simple assassins; they were hiding a huge secret. And this secret was the truth she needed to uncover.

In the days that followed, Xu Yuehuai traveled to every street and alley in Beijing, visiting dozens of families who had lost loved ones.

She listened patiently to their stories, earning their trust and respect with her sincerity and kindness.

Whenever she heard those tragic stories, a glint of anger and determination would flash in her eyes as she meticulously recorded every detail.

In a dimly lit room, Xu Yuehuai sat beside an old woman. The old woman, her hands trembling, recounted to Xu Yuehuai her experience of losing her son.

Her son had once been an exceptionally filial child, always taking care of her, but he mysteriously disappeared after a mission. The old woman wept uncontrollably, and Xu Yuehuai held her hand tightly, comforting her with warm eyes.

"Don't worry, I will definitely find out the truth for your son," Xu Yuehuai said firmly.

The old woman looked at her gratefully, her eyes shining with hope. She knew that Xu Yuehuai was a trustworthy person, and she would definitely seek justice for those dead men in black.

Through Xu Yuehuai's efforts, she gradually pieced together the backgrounds and experiences of these men in black.

She discovered that these men in black all shared similar behavioral patterns before their disappearances: they always left home mysteriously at night and returned looking nervous.

They were originally ordinary people in the capital, but were forced to join the ranks of the men in black for various reasons. Their deaths were not simple accidents, but rather a carefully planned conspiracy.

She realized that these men in black must have been manipulated. And the one manipulating them was the hidden truth behind it all.

Xu Yuehuai was filled with anger and grief, but she knew that the most important thing now was to expose this conspiracy completely. She was determined to uncover the truth, no matter the cost, and to bring those behind the scenes to justice and seek justice for the innocent men in black.