After hearing the comrades' intentions, Li Maoyuan provided two information:

First, Chen Guoquan did make a tunic in his tailor's shop, because the color of the clothes was dark gray, so it was equipped with gray buttons - it was the color of the buttons that Chen Jie, Yan Jianhua and Han Lingling found in the secret room (Ouyang Ping took the buttons to Li Maoyuan for identification), and when Chen Guoquan's wife came to pick up the clothes, Li Maoyuan also gave two more buttons - to be precise, it should be two more buttons, and Li Maoyuan nailed the two buttons behind the cover cloth of the two pockets on the top of the clothes.

The purpose of this is to prevent the buttons from being placed randomly and forgetting where to put them when needed, so the buttons are nailed to the hidden places of the clothes.

Second, Li Maoyuan's buttons are all imported from a store specializing in buttons in Confucius Temple, and this button shop is called Chen Ji Button King, Chen Ji Button King is also engaged in retail and wholesale.

According to the information provided by Tailor Li, although the buttons on Chen Guoquan's clothes were intact, his suspicion could not be ruled out.

Chen Guoquan has a soft spot for Ran Ruzhai's house, which is also quite suspicious.

The second person who likes to read newspapers is Jiang Fengqi, Jiang Fengqi's barber shop has newspapers, and these newspapers are brought to the barber shop by those customers who have a haircut to pass the time - the business of the barber shop is good, so they often have to wait in line, and after the customers finish reading the newspaper, they leave the newspaper in the barber shop, Jiang Fengqi is alone, so he often takes the newspaper that the customer leaves in the barber shop home to read slowly. Sometimes, he would sit at the door and read the newspaper for a long time - until it was torn out.

The goal is determined, but it is very difficult to lock the target, and Chen Guoquan and Jiang Fengqi cannot have direct contact with each other just because they read the newspaper and have a newspaper at home.

Chen Jie thought of the situation provided by Xie Xiaoman, at about three o'clock in the morning on January 28, Xie Xiaoman heard two cat meows, and the interval between them was two or three minutes.

There is an important detail involved in this. So, at half past five in the afternoon, Ouyang Ping sent Yan Jianhua and Han Lingling to invite Xie Xiaoman and her mother.

The conversation took place in room 106 of the hostel.

Chen Jie was in charge of the inquiry, and Han Lingling was in charge of the record.

"Xie Xiaoman, last time, you told us that at about three o'clock in the morning on January 28th, you heard two cat meows, isn't that so?"

Xie Xiaoman looked at his mother, then nodded.

"You hear voices and footsteps, don't you?"

Xie Xiaoman nodded twice very clearly.

"Can you please recall whether the sounds of speech and footsteps were made at the first meow or the second meow?"

"It was the first time the cat meowed."

This shows that after the three brothers and sisters of Ran Shixiong walked out of the aisle, another person walked through the third aisle, so who could this person be? Is it Chen Guoquan, or Jiang Fengqi? It can only be one of them.

"The second time the cat barked, did you hear the door open - or the door closing?"

"Didn't hear it, no sound other than a cat meowing. But—" Xie Xiaoman blinked a few times, looking thoughtful.

"What do you think of?"