Upon hearing this, Ning Zhiheng suddenly had a thought. He didn't have many connections in Nanjing. Among them, only the Zuo siblings were his hidden subordinates, and it was inconvenient for them to go directly to the Military Intelligence Investigation Department to find him. Everyone else knew about his unit.

For example, Liu Datong's peripheral staff can all reach him by phone.

These people must know their workplace if they can find their place of residence, but no one has come to look for them during this period of time. In other words, they are secretly inquiring about their whereabouts. Who would do such a thing?

Ning Zhiheng is always meticulous and never overlooks any clues, especially when someone is secretly inquiring about him, which concerns his safety. Could someone be targeting him?

Who is investigating me? Could it be the Japanese, just like last time outside the Military Intelligence Bureau?

But last time their target was all the officers within the Military Intelligence Investigation Department, and they didn't even come directly to him. This time they simply found his residence. Does this mean that their target is clearer this time?

Ning Zhiheng sensed a crisis. If his guess was correct, it really was the Japanese who had come to his door, which meant that he had been listed as a key target of their investigation. The situation was much more serious than last time, and it seemed that he needed to strengthen his security.

Ning Zhiheng wasn't the kind of hothead who liked to act heroically. This was the age of firearms; taking someone's life was incredibly easy. A skilled marksman only needed a gun and a bullet to send a highly skilled martial artist with years of training to his death. If someone wanted to take his life, just a few good gunmen would be enough. Even the most skilled fighter would be caught off guard and die on the spot.

Zhuge Liang was cautious throughout his life; a cautious approach ensures a safe journey. There's no harm in taking precautions; it seems my residence is no longer safe.

Thinking of this, he asked Zuo Gang, "Which family specifically told you this?"

"It's the fourth house to your right, a middle-aged woman, not very tall, who speaks with a slight Sichuan accent," Zuo Rou replied. She was specifically there to inquire about Ning Zhiheng, since a young woman could more easily lower someone's guard and make things easier.

Ning Zhiheng recalled this family in his mind. They were from Sichuan, a family of four. They had never interacted with each other before, only nodding and exchanging greetings.

Ning Zhiheng nodded and said, "Don't go to my place during this period. I won't go back for the time being either. I'll make a decision after I've investigated the situation. If anything happens, just contact me directly using a public phone."

"Young Master, should we investigate?" Zuo Gang asked eagerly. It was clear that Ning Zhiheng took this situation very seriously, which meant there was definitely something wrong. "These people have already found your residence, so they can't have gone too far. We can inquire around the area and see if any strangers have appeared."

After careful consideration, Ning Zhiheng decided that it was best for the Zuo siblings not to show themselves. If, as he suspected, the Japanese had indeed come knocking, then it would be most appropriate to leave this matter to the Military Intelligence Investigation Department. The Zuo siblings' involvement would expose them, and Ning Zhiheng did not want others to know of their existence, otherwise it would be very inconvenient for future operations.

He shook his head and said, "These things are not convenient for you to handle. I will arrange for someone else to take care of them. Don't make any rash moves, just wait for my instructions."

The Zuo siblings nodded in agreement. Ning Zhiheng did not linger and quickly left the Zuo family home, rushing back to the Military Intelligence Investigation Department. Upon returning to his office, he immediately summoned Sun Jiacheng.

"Old Sun, go out in plain clothes right now and find a way to bring me to the fourth house to the right of my residence, a Sichuan couple. Be discreet and don't alert anyone. I have something to ask them," Ning Zhiheng instructed.

"Yes, I'll take care of it right away!" Sun Jiacheng accepted the order and left.

Before the matter is fully investigated, Ning Zhiheng will not return to his residence or show his face in the vicinity. He couldn't help but feel fortunate that he hadn't gone home during this period. Otherwise, if someone really wanted to assassinate him, even if he had the ability to warn others, the outcome would have been uncertain in a moment of haste. After this incident, this residence can no longer be used.

Two hours later, Sun Jiacheng brought back a middle-aged couple. The couple walked into the office with trepidation, but their expressions immediately relaxed when they saw that it was Ning Zhiheng.

"It really is Mr. Ning! We were quite frightened. What brings you here?" the couple asked. Sun Jiacheng had forcibly brought them here on his way home, which terrified them, making them think they had encountered a villain. Seeing that it was indeed their neighbor, they were finally relieved.

Ning Zhiheng smiled and gestured for the couple to sit on the sofa. He then poured two cups of tea and placed them in front of them, saying in a kind tone, "Mr. Yang, Mrs. Yang, I'm so sorry, I'm too busy with work and really don't have time to come and bother you in person. I had my men invite you here."

Ning Zhiheng hadn't had much contact with these neighbors; he only vaguely remembered that their surname was Yang, but he couldn't recall their full names.

Seeing Ning Zhiheng's amiable attitude, Mr. Yang calmed himself down. Although Ning Zhiheng had been their neighbor for more than half a year, they had very little interaction with him, so they didn't know much about him. They only knew that he was a young military officer, but now it seemed that this neighbor was no ordinary person.

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