The letter contained only one sentence, but it made it very clear that both Sun Zichen and Sister Jing were in Biyuan's hands.

All our previous speculations were disproven by this letter.

But now, another question arises: why is this letter here? Just like the previous letter, why is it in Jiangbei?

It's obvious that there's a traitor within Jiangbei.

Su Mu and I exchanged a glance, then turned to look at Mu Xiaoyu, who had brought the letter.

Mu Xiaoyu was startled by our gazes and hid behind Zhang Zhihao.

Su Mu stood up, touched his nose, walked to the door, closed and locked it, and then turned to face Zhang Zhihao and Mu Xiaoyu.

I called out towards the bedroom, "Fei Lichao, come out! We know where Sister Jing is."

A short while later, Fei Lichao came out of the room.

Su Mu was somewhat surprised, but instead of asking why he was in the bedroom, he stared at Mu Xiaoyu behind Zhang Zhihao.

Zhang Zhihao seemed to notice Su Mu's gaze and asked, "Hey, Su Mu, what do you want to do!"

Su Mu pointed to Mu Xiaoyu behind Zhang Zhihao and said, "Have your little girlfriend sit down. I need to ask her some questions."

Zhang Zhihao frowned. "What do you mean?"

Su Mu said, "Don't worry, I won't do anything to her before the matter is investigated. So Zhang Zhihao, have her sit down. I'll only ask questions."

Zhang Zhihao remained vigilant.

I said, "Zhang Zhihao, it's okay. With you here, what could possibly happen?"

Zhang Zhihao trusted me, nodded, and pulled his girlfriend Mu Xiaoyu to sit on the sofa.

Su Mu and I stared at Mu Xiaoyu.

Su Mu pointed to the two letters on the coffee table and asked, "Do you know anything about these two letters?"

Mu Xiaoyu looked at the two letters on the coffee table with a puzzled expression, then nodded and said, "I know."

Su Mu nodded, picked up the first letter, the one addressed to Sun Zichen, and asked, "Did you personally hand this letter to Sun Zichen?"

Mu Xiaoyu nodded, puzzled. "Yes, what's wrong?"

Zhang Zhihao then understood what we were asking and stood up, saying, "Hey, Su Mu, Brother Lu, what do you mean? Do you suspect Xiaoyu is a traitor?"

Su Mu said, "Xiao Zhang, calm down. I have no suspicions. I'm just asking a few questions. You don't need to worry about anything."

Zhang Zhihao looked at me with suspicion, "Brother Lu, you think so too?"

I comforted him, saying, "Don't overthink it. We're just asking to find out the truth. There's no need to be nervous. Besides, we don't suspect that Xiaoyu is the mole. If she were the mole, why would she swagger in front of us and deliver a message to us? Wouldn't she be courting death?"

Mu Xiaoyu also stood up from the sofa, looking bewildered. She tugged at Zhang Zhihao's arm and looked at us with a slightly frightened expression.

Zhang Zhihao looked at me and said, "Brother Lu, I trust you more if you ask me."

Su Mu frowned slightly upon hearing this.

I glanced at Su Mu, took the two letters from his hand, and asked, "Don't be afraid, we just have some things to clarify. I want to know, who gave you these two letters?"

Mu Xiaoyu glanced at Zhang Zhihao, who tightened his grip on her hand and said, "It's okay, I'm here. Go ahead and say it."

Mu Xiaoyu looked at me, then shook her head.

"What's the meaning?"

Mu Xiaoyu said, "I don't know who it was. I just happened to see these two letters when I went home this morning. There was also a note saying that these two letters should be delivered to Sun Zichen and Su Mu. I delivered one letter to Sun Zichen this morning. Then the note said to deliver it to Su Mu this afternoon, so I brought it over."

"Didn't you see what was written inside the envelope?" I asked.

Mu Xiaoyu shook her head, "I haven't seen it."

I said, "So you don't know who delivered the letter to you?"

"Hmm." Mu Xiaoyu nodded, her eyes still blank, as if she didn't know what had happened.

I glanced at Su Mu and asked, "Is there anything else you want to ask?"

Su Mu looked at Mu Xiaoyu and said, "I believe you are not a traitor, but if I find out that you really are, I don't mind doing anything to you."

Su Mu's words were tantamount to a threat.

Mu Xiaoyu hid behind Zhang Zhihao in fear.

Zhang Zhihao's face was filled with helplessness.

Su Mu immediately said to Zhang Zhihao, "Keep an eye on your girlfriend these next two days. I don't want what I'm hypothesizing to happen, you know?"

Zhang Zhihao nodded with his eyes closed.

Mu Xiaoyu remained unaware of what had happened and stayed close to Zhang Zhihao.

Su Mu said, "Dr. Lu, let's go outside and talk. This matter concerns us all."

"Um."

I patted Zhang Zhihao on the shoulder, and together with Su Mu, we left the house and went out into the corridor.

Su Mu walked upstairs, saying as he went, "Ask whatever you want. June 15th is the day after tomorrow, so we still have one day to prepare."

"Who is Li Shujiang?" I asked.

Su Mu said, "Li Shujiang is the head of Biyuan and the person who initially cooperated with me, but later our cooperation broke down because of our relationship, and we became mortal enemies."

A short while later, we went up to the rooftop.

The rooftop was exactly the same as yesterday, with someone cleaning it. Su Mu waved his hand, and the cleaner left with a broom and sweeper.

We stood on the rooftop, a gentle breeze blowing, the sky appearing overcast.

I asked, "How does Biyuan's current armed force compare to Jiangbei's?"

Su Mu shook his head: "I don't know about that. I didn't plant any spies among them, so I basically don't know anything about what's going on in Biyuan."

I turned to look at him and asked curiously, "Didn't you send anyone to monitor them?"

Su Mu smiled and said, "It's not that easy. I did send people to monitor us for a while, but it was useless. We didn't get any useful information, so I gave up."

I then asked, "Who do you think this mole is?"

Su Mu shook his head, "I don't know. Xiaoyu can be ruled out. I know that girl. She's been in Jiangbei since the beginning and has hardly ever gone out. It can't be her."

"Then why did you threaten her just now?"

Su Mu looked at me and said, "If I don't say this, Xiao Zhang won't take it seriously. What if the traitor uses this girl to do something?"

After thinking about it carefully, I realized that this is indeed the case.

"What are you planning to do the day after tomorrow?" I asked.

Su Mu said, "We need to discuss this carefully. First of all, we can be sure that Sun Zichen and Lu Jing will not be in any danger before the day after tomorrow. As for their purpose in doing this, we don't know. Maybe they want to kill me, or maybe they want to blackmail me. We will only know on that day."

(End of this chapter)