Fortunately, perseverance pays off, and soon Qian Yuan discovered a useful clue.

In Liu Zhen's room, there was a calligraphy practice book. The book was filled with writing, and the handwriting was gradually changing, from stiff to smooth, as if she was imitating someone else's handwriting.

The content was the letter Xu Feng received.

In addition, Liu Zhen's original notebook and Liu Ying's homework were found in the room. A comparison of the two showed that their handwriting was completely different.

This shows that the letter was probably written by Liu Zhen imitating Liu Ying's handwriting.

At that moment, Su He also noticed something amiss behind the door.

There seem to be black dots on the walls here.

Su He pointed it out to everyone, and Hua Qing leaned closer to take a closer look.

"It looks like blood!"

Seeing this, Captain Yu took a spoon, scooped up a drop, put it in a bowl, dissolved it in water, and sure enough, it was red.

"It's blood!"

Team Leader Yu's gaze was serious.

"Let's go back, we've almost finished investigating."

After saying that, he left with several notebooks.

Su He was somewhat disappointed because there was no DNA technology available to check if the bloodstains belonged to Liu Ying, so this evidence was mostly useless.

However, this also shows that the Liu family was not wronged.

...

The Liu family was detained at the police station for a day.

The police began interrogating them separately the following morning.

By this time, they were already getting impatient and scared.

In particular, the Liu family has several children. Besides Liu Zhen, there are three other children born to Liu Tianxiong and Hu Feng later in life: two boys and one girl. They are Liu Quan, 16 years old; Liu Lan, 14 years old; and Liu Bao, 12 years old. Liu Lan is the girl.

Because children are the easiest to get past, they are the ones who are investigated first.

Liu Quan and Liu Lan are older and have stronger self-control. They said they didn't know anything when asked. When asked about their relationship with Liu Ying, they said it was very good. Their answers were exactly the same. Or they would just stay silent. It was obvious that they had been instructed to do something.

The younger one, perhaps because he's usually spoiled, couldn't take it after just one night at the police station and was on the verge of a breakdown. When questioned, he started cursing at Liu Ying and even said she deserved to die.

However, when Captain Yu asked if he knew how she died, he denied it.

"It wasn't me, I don't know, my whole family doesn't know!"

Upon hearing this, Captain Yu frowned slightly and said, "You're still trying to deny it? Your brother and sister have both admitted it; they all say you killed them!"

Although you are not strong, you eat a lot and are quite strong. Liu Ying is no match for you.

You didn't like her, so you pushed her down, and she hit her head and died. You weren't satisfied, so you kicked her a few more times. Only when she stopped responding did you realize she was dead. Then your family all covered it up for you.

After hearing what Captain Yu said, Su He glanced at him in surprise and found that his tone was sincere and he spoke as if it were true. If she hadn't been sure that he had made it all up, Su He would have believed it.

Sure enough, Captain Yu is indeed a veteran in solving cases at the police station!

Liu Bao clearly believed him too, his expression one of disbelief. He then shouted, "It wasn't me! They're framing me! I didn't kill her! I just kicked her a few times! I didn't kill her!"

Hearing this, Su He and the others were slightly shocked. Liu Bao really knew. So they became even more vigilant.

Captain Yu asked, seemingly incredulous, "You only kicked me a few times? But your older brother and sister said you caused all those injuries!"

"Nonsense, they're lying to you. It wasn't me. My eldest sister and she got into a fight, and I went to help. Later, my eldest brother and second sister also started fighting. We were too strong, and she was pushed so hard that she hit the corner of the table and died. It wasn't me!"