The Courtyard House: The story begins with He Yuzhu beating up the White Widow.

Zhang Qiang stopped and asked, "Zhu Zi, what's wrong?!"

He Yuzhu replied, "Director Zhang, I have something to report to you. On my way back from dropping a friend off at home, I encountered a person on Dongzhimen South Street. I saw this person when I was seven or eight years old. At that time, he was wearing a Japanese soldier's uniform."

Zhang Qiang took He Yuzhu's report very seriously. He asked, "He Yuzhu, are you sure you didn't see it wrong?!"

He Yuzhu answered decisively, "I'm absolutely sure I didn't see wrong. I followed him from a distance and saw him enter a large courtyard. I heard the people inside call him Old Mei."

Zhang Qiang's eyes darted around, and he asked, "Zhu Zi, do you dare take me to identify that person?!"

He Yuzhu nodded emphatically and replied, "I dare!"

Without saying a word, Zhang Qiang immediately went back to the station to call for reinforcements. About fifteen minutes later, Zhang Qiang led three men and followed He Yuzhu toward Mei Chuan Du Zi's residence.

The group quickly arrived at the entrance of the courtyard where Mei Chuan Du Zi lived. He Yu Zhu released his divine sense, scanning the entire courtyard. Mei Chuan Du Zi had already walked out of the main gate. Not long after, Mei Chuan Du Zi appeared in front of He Yu Zhu. He Yu Zhu immediately winked at Zhang Qiang and gestured towards Mei Chuan Du Zi with his lip.

Zhang Qiang immediately understood and coughed lightly twice. The other three policemen beside him immediately dispersed. The moment Mei Chuan Duzi saw Zhang Qiang, her heart skipped a beat, and an ominous premonition instantly rose in her heart. However, Mei Chuan Duzi quickly calmed down. She felt that she had been hiding here for so many years without anyone discovering her, and this time would be no different. However, this time Mei Chuan Duzi was unlucky; she encountered He Yuzhu, a man with special abilities. Just as Mei Chuan Duzi walked past Zhang Qiang, Zhang Qiang suddenly turned around, dislocated Mei Chuan Duzi's jaw with a punch, and then directly shoved Mei Chuan Duzi to the ground.

With her jaw dislocated, Umekawa Wataru was unable to speak and struggled incessantly.

The other three police officers immediately stepped forward to help Zhang Qiang subdue Mei Chuan Duzi. While Zhang Qiang was examining Mei Chuan Duzi's teeth, He Yuzhu leaned over, pretending to scrutinize Mei Chuan Duzi, and feigned excitement, saying, "Chief Zhang, that's him! It's him!"

Zhang Qiang glanced at He Yuzhu, then casually pulled the venomous fangs out of Mei Chuan Du Zi's mouth. He then checked Mei Chuan Du Zi's collar and buttons again to make sure there was no more poison. Only then did he restore Mei Chuan Du Zi's jaw.

At this moment, an old man who looked somewhat like Yan Bugui heard the commotion and came out of the courtyard, saying, "Comrade, my name is Yan Bufu, and I am the manager of this courtyard."

Zhang Qiang pointed at Mei Chuan Du Zi and asked, "Do you know him?!"

Yan Bufu nodded and said, "I know him! His name is Mei Chuandu, and he lives in the west wing of the backyard."

Zhang Qiang said, "Take us there."

"Yes!" Yan Bufu responded, leading Zhang Qiang and three policemen to escort Mei Chuan Duzi into the courtyard. He Yuzhu followed closely behind.

With Yan Bufu leading the way, the group quickly arrived at the door of the house where Mei Chuan Duzi lived. A policeman took the key from Mei Chuan Duzi and unlocked the door. Zhang Qiang pushed open the door and went inside, quickly scanning the room. He then walked to a large wardrobe. Zhang Qiang hesitated for a few seconds before opening the door. There were only a few changes of clothes inside. Zhang Qiang immediately sensed something was wrong. He looked at Yan Bufu and asked, "Is he alone?!"

Yan Bufu replied, "Yes! He's all alone."

Seeing that Zhang Qiang had already noticed the wardrobe, He Yuzhu decided to give it another push. As if watching a spectacle, He Yuzhu entered Mei Chuan Du Zi's room. He walked to the wardrobe with feigned nonchalance, then pretended to accidentally step on a raised tile about the size of a mahjong tile next to it. The wardrobe then slowly moved to the side. Suddenly, a hidden entrance to a secret room came into view for everyone present.

Zhang Qiang glanced at He Yuzhu, then looked at Mei Chuan Duzi and asked, "What's down there?!"

"Hmph!" Umekawa Wataru snorted coldly and turned her head away. She adopted an attitude of "I won't say anything, what can you do to me?"

Zhang Qiang hadn't really expected Mei Chuan Du Zi to provide an answer. He turned to Yan Bu Fu and asked, "Comrade, do you have an oil lamp or a torch at home?!"

"Yes! I'll go get it for you!" With that, Yan Bufu ran out of Meichuan Duzi's house. About five or six minutes later, Yan Bufu returned with a kerosene lamp. Yan Bufu handed the kerosene lamp to Zhang Qiang.

Zhang Qiang took out a match and lit the kerosene lamp. Then, carrying the lamp, he carefully descended the steps into the secret room. After about ten minutes, Zhang Qiang emerged from the secret room. He said to the young policeman guarding the entrance, "Xiao Chen, go back to the station quickly. Have the instructor bring reinforcements immediately."

"Yes!" Xiao Chen replied and immediately ran out.

He Yuzhu quietly walked up to Yan Bufu and asked, "Grandpa, I want to ask you about someone."

Yan Bufu sized up He Yuzhu and asked, "Who are you trying to find out about?!"

He Yuzhu asked, "Grandpa, do you know Yan Bugui?!"

Yan Bufu gritted his teeth and replied, "I know him! I'd recognize him even if he were ashes." He then asked, "What?! You live in the same courtyard as him?!"

He Yuzhu asked curiously, "Grandpa, how did you know?!"

"Just a guess!" Yan Bufu replied, then asked, "Where does he live now?!"

He Yuzhu replied, "The front yard of No. 95 Nanluoguxiang."

Yan Bufu muttered to himself, "This bastard certainly knows how to pick a spot!"

He Yuzhu said, "Uncle Yan, Yan Bugui always says, 'You won't go poor from eating or dressing, but you will if you don't plan ahead.' Isn't that a family motto of your Yan family?!"

Yan Bufu said, "Only a traitor like him would enjoy scheming!"

"A traitor who has served three masters?!" He Yuzhu's curiosity was instantly piqued by Yan Bufu's words. He Yuzhu took out a cigarette case from his pocket, pulled out a cigarette, and handed it to Yan Bufu, saying, "Sir, would you mind telling me what happened?!"

Yan Bufu took the cigarette, sized up He Yuzhu, and asked, "You want to hear it?!"

"I want to hear it!" He Yuzhu nodded.

Yan Bufu said, "My eldest uncle's family has four daughters and no sons. When Yan Bugui was three years old, my grandfather arranged for him to be adopted by my eldest uncle. Unexpectedly, three years after Yan Bugui was adopted, my eldest uncle's wife gave birth to a son. My eldest uncle didn't want to raise Yan Bugui anymore, so he returned him to his father." At this point, Yan Bufu took two deep drags on his cigarette.