Soon, Sheng Yunrong spoke again: "Besides, I have something more important that I want you to help me with."

Tu Subo frowned slightly, a hint of doubt flashed in his eyes, but he still maintained a polite smile: "Miss, please tell me, no matter what it is, I will do my best."

Sheng Yunrong sighed softly, with a firm look in her eyes: "I want you to help me find out the truth about the disappearance of my father, Lord Sheng."

Tu Subo's expression suddenly became serious. He knew that this matter was of great importance and involved the interests and reputation of the Sheng family. He was silent for a moment, then slowly said, "Miss, this matter is of great importance. I need time to investigate."

Sheng Yunrong nodded slightly, with a hint of expectation in her eyes: "I understand, but please do it as soon as possible. This matter concerns the future of my Sheng Mansion, and I can't let it become an unsolved case."

As the two were talking, there was a sudden noise in the banquet hall of Sheng Mansion. Sheng Yunrong frowned and turned to look in the direction of the banquet hall. She saw Sheng Rurong, the second lady of Sheng Mansion, coming over aggressively with a group of servants.

As soon as Sheng Rurong arrived, she sneered, "Sister, what are you doing? Do you think that since father is missing, you can take sole control of the Sheng Mansion?"

Sheng Yunrong smiled lightly, but her eyes revealed a firmness: "Second sister, you misunderstood. I just want to find my father's whereabouts and have him return safely."

Sheng Rurong curled her lips in disdain: "Who knows if you have ulterior motives? Don't forget, the Sheng family's industry and power were created by my father. What qualifications do you have to inherit it?"

Seeing this, Tu Subo couldn't help but interrupt and said, "Second Miss, the eldest lady of the Sheng Mansion is sincere, why don't you believe it?"

Sheng Rurong glared at Tu Subo and sneered, "Who do you think you are? How dare you speak in front of me?"

Tu Subo's face darkened, and he was about to explode, but was stopped by Sheng Yunrong. Sheng Yunrong smiled gently and said to Sheng Rurong: "Second sister, I know you have misunderstood me, but I will use practical actions to prove my innocence. As for Tu Subo, he is my friend and a guest of the Sheng Mansion. You have no right to be rude to him."

Sheng Rurong was so angry that her face turned purple. Just as she was about to explode, she heard the servant of the Sheng Mansion come to report: "Miss, there is a woman named Lin Shiyin outside the door asking to see you. She said she has something important to tell you."

Sheng Yunrong frowned, feeling uneasy. She turned to Tu Subo and whispered, "Tu Subo, come with me to meet this Lin Shiyin. Maybe she knows something."

Tu Subo nodded in agreement, and the two of them came to the door of Sheng Mansion together. Lin Shiyin was wearing a long green dress, with a beautiful face and elegant temperament. When she saw Sheng Yunrong and Tu Subo, she couldn't wait to speak: "Miss, I have something to tell you, the truth about the disappearance of Master Sheng."

Sheng Yunrong's eyes flashed with surprise, and she hurriedly said, "Please tell me, I'm here."

Lin Shiyin said in a deep voice: "Before Lord Sheng disappeared, he secretly went to the northwestern border to investigate a major case involving the court. It is said that he discovered a shocking secret there, but unfortunately met with an accident."

Tu Subo immediately became alert: "Ms. Lin, are you telling the truth?"

Lin Shiyin nodded, a trace of sadness flashed in her eyes: "I saw it with my own eyes. Lord Sheng paid the price of his life for our Sheng Mansion and the entire court."

Sheng Yunrong was heartbroken and burst into tears: "Father, why did you hide it from me? Why did you take on such a heavy responsibility alone?"

Lin Shiyin comforted her, "Miss, Lord Sheng was doing this for the country and the people, and for the future of the Sheng Mansion. Before he died, he asked me to give you this letter."

Sheng Yunrong took the letter and opened it with tears in her eyes. Every word in the letter was the teachings and expectations of Sheng Yunrong.

…

Sheng Yunrong smiled slightly, her eyes moving, and said softly: "Tu Subo, I would like to ask you for a favor." After that, she took out a yellowed ancient book from her sleeve and handed it to Tu Subo.

Tu Subo took the ancient book and frowned slightly, thinking that this book seemed unusual. He lowered his head and flipped through it, and couldn't help but asked in surprise: "This is the "Xuan Yue Secret Book". Miss, how did you get it?"

Sheng Yunrong chuckled and said, "This is a family heirloom, so it must be very valuable. Tu Subo, I know you are proficient in martial arts and know Qimen Dunjia. I would like to ask you to help me study this secret book and see what secrets are in it."

Tu Subo's eyes flashed with excitement. He knew that this secret book was extraordinary. If he could study it thoroughly, it would definitely help him improve his martial arts. He nodded and agreed: "Miss Sheng, rest assured, I will do my best."

At this time, the maid Xiang Zhu came in and said hurriedly: "Sister, you have to be careful when studying the secret book. There may be some danger hidden in this secret book."

Sheng Yunrong glanced at Xiang Zhu and smiled, "Don't worry, Xiang Zhu. With Tu Subo here, I'll be fine."

One day, Tu Subo was looking at a passage in the secret book and wondered, "This passage seems to describe a strange formation, but I have never heard of it."

Sheng Yunrong smiled slightly and said, "This formation is called the 'Tian Gang Formation'. It is an extremely powerful defensive formation. It is said that as long as this formation is deployed, it can resist thousands of troops."

Xiang Zhu was surprised when he heard this: "Then why don't we set up this formation to protect Sheng Mansion?"

Sheng Yunrong shook her head slightly and said, "Although the Tiangang Formation is powerful, the person who sets it up must be proficient in it, and the mysteries contained in the formation also require extremely high cultivation to control. Although the three of us have a certain foundation, we are still far from being able to set up the Tiangang Formation."

Tu Subo pondered and said, "Then can we first try to practice the skills in the secret book to improve our own cultivation, and then set up the formation?"

Sheng Yunrong's eyes flashed with determination, and she said, "Okay, let's practice the technique first. Tu Subo, you will be responsible for studying the formation, while Xiang Zhu and I will practice the technique."

The three of them started their long journey of cultivation. During this period, the affairs of the Sheng Mansion were still carried out in an orderly manner. During the cultivation process, Sheng Yunrong and Xiang Zhu gradually mastered the skills in the secret book, and Tu Subo also studied the Tiangang formation thoroughly.

One day, Tu Subo looked at the formation diagram in his hand and said excitedly: "Miss Sheng, we can now set up the Tiangang formation."

Sheng Yunrong's eyes flashed with joy, and she said, "Okay, let's start setting up the formation. Xiang Zhu, go inform the butler and ask him to prepare everything."

In the backyard of Sheng's house, the three began to set up the formation. They carefully inserted the formation flag into the ground, and set the center of the formation in a hidden place according to the formation diagram. As the formation was completed, a layer of light blue light enveloped the sky above Sheng's house, as if forming an invisible barrier.

After the formation was set up, Sheng Yunrong and others breathed a sigh of relief.

At this time, Sheng Yunrong looked at Tu Subo and Xiang Zhu, and said with emotion: "The three of us have known each other since childhood and have experienced many ups and downs together. Now, we finally have the ability to protect the Sheng Mansion. Thank you."

Tu Subo and Xiang Zhu said in unison: "Miss, you are too polite. We are willing to serve the Sheng Mansion."