It was exactly the same as the photo she had seen.

Song Yun whispered a few words to Professor Liu, who nodded imperceptibly. Although she did not have any secret mission in attending the meeting, she knew what she should do.

After Song Yun told her where she was going, she certainly wouldn't refuse, but she couldn't seem too eager either, so she first looked at two nearby booths and talked with the engineers at each booth for a while before slowly walking to the booth Song Yun was going to. Just like the previous booths, Professor Liu first looked at the machine tools and then discussed things with the engineers at the booth.

Song Yun handed Professor Liu a cup of coffee. While Professor Liu was drinking it, Song Yun asked Cheng Tianyuan, "Are you Chinese?"

Cheng Tianyuan's body stiffened slightly, then he turned his head and met Song Yun's gaze.

Cheng Tianyuan's gaze lingered on the badge on her chest for a moment, and then he replied, "I lived there for a while. Hello, I'm Cheng Tianyuan, currently doing research at MIT."

"Song Yun." She extended her hand and gently shook his. His palm was a little cold, but his grip was firm.

Song Yun retracted her hand, and a trace of nervousness appeared on Cheng Tianyuan's face. He tightly grasped the note in his palm.

Cheng Tianyuan turned around to drink some water. While doing so, he read the contents of the note and confirmed the other party's identity. Then he turned back and continued to talk with Professor Liu. He looked calm and composed throughout the whole process, without any abnormality.

Just as Professor Liu turned to leave, Cheng Tianyuan suddenly pretended to cough and lowered his voice so that only Song Yun could hear him. He said, "See you in the lounge area on the east side of the exhibition hall in ten minutes."

Song Yun nodded slightly, pretending nothing had happened and followed Professor Liu to leave.

Ten minutes later, Song Yun arrived at the east lounge area. Not many people were there, with a few sofas scattered in the corners. The lighting was much dimmer than in the exhibition hall. Cheng Tianyuan was already seated on one of the sofas, holding a newspaper, his eyes warily scanning the surroundings through the edge of the paper.

Song Yun walked over, sat on the sofa behind him, and whispered, "Time is running out, I need to know your situation."

Cheng Tianyuan covered his mouth with the newspaper in his hand, his eyes showing a hint of anxiety. "My family is under house arrest in a house in the suburbs of N㹐, with security guards outside watching them 24 hours a day. I tried to approach them several times, but was stopped every time. They know I have important technical information and won't let me go easily."

Song Yun asked, "Do you have a plan?"

"Yes, but I need your help." Cheng Tianyuan pulled a folded piece of paper from his pocket and threw it over his shoulder, using the newspaper as a cover. It landed right in Song Yun's hand. "This is the address of the house and the security guard's shift change time. I need you to drive to this place to meet me three nights from now."

Song Yun took the note, glanced at it quickly, and then stuffed it into her pocket: "I'll make the arrangements. But are you sure you can bring your family out?"

Cheng Tianyuan's eyes became firm: "I have to try. They have already threatened me that if I don't hand over the technical information, they will harm my family. I can't wait any longer."

Song Yun nodded: "Okay, I will be there on time the day after tomorrow night. Be careful."

Cheng Tianyuan nodded slightly, then stood up and said in a low voice: "Thank you."

He turned and left, his back looking a little thin, but his steps were extremely firm.

Three minutes later, Song Yun stood up and walked back into the lights of the exhibition hall.