Jiang Chuan and Zhang Yulan reported first.

Jiang Chuan said, "Yulan and I visited Chen Dazhuang's neighbors, the neighborhood committee, and the street committee. We also went to the plastics factory to ask his coworkers, team leaders, and relevant supervisors."

"They are all quite satisfied with Chen Dazhuang's performance. His coworkers and supervisors say that Chen Dazhuang is a very dedicated worker."

"When he occasionally takes leave, it's because his sister needs help, is unwell, or is in a bad mood, so he goes home to be with his sister. He has never taken leave for any other reason."

"Neighbors also said that Chen Dazhuang often bought Chen Xiuhua all kinds of delicious food and clothes. Although she didn't have parents, she didn't feel wronged by having her brother around."

Zhang Yulan concluded, "From what we have investigated so far, Chen Dazhuang treats Chen Xiuhua very well and his work is normal."

"Qian Xiao, Xiaodie, you two should speak too." Song Qingyun looked at Qian Xiao and Bai Xiaodie.

Qian Xiao gestured to Bai Xiaodie to speak first.

"We have been following Chen Dazhuang for the past two days. He goes to work on time every morning and comes home on time every evening. Before going home, he goes to the vegetable market to buy vegetables and then cooks."

"He seems to be behaving normally at the moment, but we haven't spent enough time with him, so we're not sure if he'll sneak off to do something else after returning home at night."

"From this point of view, there is nothing suspicious about Chen Dazhuang." Jiang Chuan said.

Qian Xiao and Bai Xiaodie exchanged glances.

Bai Xiaodie continued, "We can't see any problems on the surface, but there is one thing that is very suspicious."

Everyone looked at Bai Xiaodie.

Bai Xiaodie blushed slightly.

Then she said, "I noticed that my sister Chen Xiuhua was not in a good state when she went out. She walked slowly, as if she was injured. When she came home at night, Chen Xiuhua always lingered at the door for a while before entering."

"When children went to play with her, Chen Dazhu would refuse, saying that Chen Xiuhua was in a bad mood and didn't want to go out and play."

"We asked the child, and she said Chen Xiuhua asked her to go play with her when she was at school."

"We suspect that Chen Xiuhua may have been threatened or abused by Chen Dazhuang," said Qian Xiao.

Song Qingyun frowned, "We can't rule out this possibility. Let's find a way to contact Chen Xiuhua and confirm whether she has any injuries."

"Ask the child about the details of her relationship with her brother. Perhaps she can provide us with new clues. Meanwhile, we can continue to track Chen Dazhuang."

"Teacher Song, I have a cousin who is the principal at Chen Xiuhua's school. Xiaodie and I can go as substitute teachers and see if we can get in touch with Chen Xiuhua."

"Once we gain Chen Xiuhua's trust, we can better understand her situation."

"Jiang Chuan and I will be responsible for tracking, working in two shifts. Jiang Chuan, I will watch during the day, and I will go home with Teacher Song at night." Qian Xiao said.

Jiang Chuan nodded and said, "No problem, I'll catch up on my sleep during the day and work at night."

After the four of them had discussed it, they looked at Song Qingyun and waited for her nod.

Song Qingyun nodded, "Okay, thank you all for your hard work."

Everyone left in response.

As long as it is confirmed that Chen Dazhuang has abused Chen Xiuhua, he can be arrested first.

Song Qingyun has not yet found the motive for the crime.

When Chen Baozhu and his wife were alive, Chen Dazhuang was always well taken care of.

Having lost both parents at the same time, their family lost its biggest financial support.

Does Chen Dazhuang have a motive for committing the crime?

Song Qingyun relaxed slightly, leaned back in his chair, and tapped the table lightly with his fingers.

Everyone has a reason for doing something. Once the motive is determined, the case will be solved.

At noon, Song Qingyun returned to his own courtyard.

Xia Weian had already prepared lunch, and the couple chatted while eating.

Xia Weian tidied up the house and the garden again.

Everything that should be planted this season can be planted.

In the afternoon, Song Qingyun continued to work and organize her information. If help was needed during the interrogation, she would go over to help.

Time passed quickly and it was time to get off work.

Qian Xiao and Jiang Chuan have completed the handover.

Before Jiang Chuan left, Song Qingyun specifically reminded him that he was only to follow and not to arrest him. If he found that something was wrong, he should leave immediately to ensure his own safety first.

Bai Xiaodie and Zhang Yulan said that they would go to accompany Jiang Chuan when they have time, so Song Qingyun can rest assured.

Song Qingyun knew that these young people were willing to work, so he gave them a few instructions and drove home with Qian Xiao and Xia Weian.

Three days later.

When Jiang Chuan was following Chen Dazhuang at night, he finally discovered the problem.

Chen Dazhuang quietly walked out of his house at night and went to an underground casino.

Jiang Chuan was shocked, but in order not to alert the criminals, he did not immediately call for support to arrest them, but waited outside the casino.

It was past three in the morning when Chen Dazhuang came out, cursing.

"What a bad luck! I lost again!"

"Da Zhuang, don't be angry. The purpose of playing cards is to have fun. You may lose today and win tomorrow." A man with a pointed chin and monkey face followed behind him and put his arm around Chen Da Zhuang's shoulders.

Chen Dazhuang shrugged and shook his hand away. "Don't try to trick me. How much do I owe this month?"

"You still owe about a hundred yuan this month. Brother Dazhuang will have it in a few months of work."

"Wait, I'll pay you back part of it with my salary this month." Chen Dazhuang said and was about to leave.

"Brother Dazhuang, your little sister looks pretty good to me..."

Chen Dazhuang gave the sharp-mouthed man a sidelong glance and said, "Why, she's only nine years old, and you want to take her back?"

"Brother Dazhuang, what kind of joke is this? I have a distant relative who wants to find a child bride. He happened to see that Xiuhua is pretty and capable, so he asked me to come over and tell her about it."

"How much?" Chen Dazhuang asked as he lit a cigarette and leaned against the wall.

"I'm a rich man, give me this number..." The skinny monkey stretched out five fingers, representing five hundred.

Chen Dazhuang tutted his mouth in disdain. "Not for now. My salary is still enough. When my salary is not enough, we can discuss this matter again."

"No, Brother Dazhuang, when your salary is not enough, you may not be able to get this price anymore."

"You think, raising her is going to cost you money anyway, so why not just send her off as a child bride? Then you can take the money and tell others that you're sending her to be raised by relatives in the countryside."

"You don't have to take care of her. You don't even have to cook for her."

Chen Dazhuang snorted coldly, "Who told you that I cooked for her? It's that little bitch who serves me every day. She does all the housework in our house."

"She washes my feet now. I sold her as a child bride. Who will serve me in the future? When I'm angry, I can beat her up to vent my anger."

"Brother Dazhuang, if you hit her, the little girl will cry and make a fuss. It won't be good for you if the neighbors hear it."

"Do you know why no one knows why my father beats my mother?" Chen Dazhuang suddenly showed an evil smile.