"My dad knows this, and he won't let me say it." He Fang said.

"Xiaofang, what are you talking nonsense, your father doesn't know anything, he just suspects." Du Yuelan said. Speaking of this, she stopped talking and didn't say any more, it seemed that she also had something unspeakable, and she didn't dare to tell the truth for a while.

"What does he suspect?" Zheng Wanjiang asked.

"This? Don't ask, Captain Zheng, I don't know anything, you can ask him when he comes back. Du Yuelan said.

"You're going to check his room, and I'm going to give you permission to do it."

She finally agreed with Zheng Wanjiang and them to check He Jinqiang's room, but there was no key to He Jinqiang's room. Zheng Wanjiang understood that they had a lot of concerns at present, they must have heard some news, and it showed that there was a problem here, so he didn't say anything more, only looked at the results of the inspection room.

Coming to the door of He Jinqiang's room, Zheng Wanjiang found that the pores of the door were relatively large, and there were two playing cards on the windowsill, one was the King of hearts and the ace of hearts, with obvious dents on them. He looked at it thoughtfully for a while, and asked Du Yuelan if he knew these two playing cards, Du Yuelan's mother and daughter shook their heads, saying that they didn't know what was going on, after he applied the medicine, he didn't find fingerprints, he understood what was going on.

Someone used this poker card to open He Jinqiang's room. Later, he inadvertently threw the playing cards on the windowsill, probably because he was so flustered at the time, that the perpetrator ignored the matter, leaving traces. Then, he expertly opened the secret lock of the door with playing cards, proved his judgment, and put the two playing cards into the inspection bag and began to inspect He Jinqiang's room.

Entering the room, this is an inverted room, he looked around this house, there is a back window at the back, next to it there is a hanger that falls on the ground, but there are no clothes hanging on it, the whole room is about ten square meters, the interior furnishings are not much but very neat, there is a single bed in the northwest corner, there is a writing desk in the front window, there is a lamp on the desk, there is a bookshelf next to the door, there are some books on the shelf, and there is a wardrobe in the southwest corner.

Zheng Wanjiang approached the desk and found that the dust in the middle was different from other places, there were obvious traces of being wiped, but no fingerprints were found. He opened the middle drawer, and found that it was locked, and he looked closely at the dust on the table, where there was less dust than elsewhere, and on the desk there was a lipstick pen, which was placed upright.

Zheng Wanjiang asked Huang Limei to record the specific location of the red pen with a video camera. Then, I wanted to extract the fingerprints on it, but found that there were no traces of fingerprints, which is a bit strange, it is impossible, there should be the fingerprints of the user on it, and why there are things used by women in the room.

"Is this lipstick pen yours?" Zheng Wanjiang asked He Fang.

"This lipstick pen is not mine, I don't use this brand, the price is too expensive, it sells for more than 400 yuan on the market, maybe my brother bought it for Sister Qiulan, and I haven't given it to her yet, so I don't know very well." He Fang said after looking at it.

Zheng Wanjiang unscrewed the red pen and found that someone had already used it, it seems that someone deliberately put it here, and intentionally erased the fingerprints, there must be a reason for this, maybe it is a conspiracy, whose lipstick pen is it.