The police found that two kinds of oil paints had been mixed together when they tested the paint. Although they were the same color, the compositions of the two kinds of oil paints were different because they came from different brands.
After some analysis, they inferred that someone poured one kind of oil paint first, then someone else poured another kind of oil paint afterward.
"According to the evidence we've gathered up until now, it's likely that some students wanted to play a prank, which was taken advantage of by the culprit." The police held a meeting in their temporary meeting room.
"Well, it's possible that some students poured the paint first and the suspect came later. Now we need to find out which student poured the oil paint."
"That Lu Meng is the biggest suspect."
"I don't agree with that. She came to the police station last night," someone disagreed. "The headmaster came to pick her up and he said that he sent her home personally. And we know she stayed at home after she came back because of the housemaid's statement. The housemaid went to the washroom several times during the night and said that she saw Lu Meng asleep on the sofa in the living room."
"She went to the police station?"
"En... because of fighting." That policeman nodded. "She looked very thin and seemed to be weak, but she is really very fierce."
The policemen stared each other in the eyes.
"Lu Meng needs to be investigated further. After all, she was mostly suspected because the headmaster said she entered the auditorium as he was leaving."
"En... But she didn't carry anything at that time and came out quickly. According to the time when the doorkeeper saw her leave, we could speculate that she stayed in the auditorium only for several minutes. She didn't have enough time to do anything. Then she went to the police station because of some altercation and was sent home by the headmaster."
"Investigate more carefully," the policeman who seemed to be the leader concluded in the end.
When police investigated who poured the oil paint first, a student confessed saying she did it. She wasn't allowed to join the class performance, leading her to pour the paint during the night because of her grudge.
But she didn't expect that things would turn out like this. She didn't know why there was blood beneath the oil paint. She was afraid. After struggling for a long time, she decided to confess what she had done.
When the student came to confess, Ming Shu was brought in for questioning. After hearing the student's story, Ming Shu lifted her eyebrows and asked her in front of the police, "You did it? How did you enter the auditorium? I remember that I locked the door when I left."
The lock on the auditorium's door was an instant lock. The door was opened when Ming Shu came in because the headmaster was inside.
But once the door was locked, it could only be opened with a key. And Ming Shu locked the door when she left.
"I..." The girl's face became pale. "I have the key."
"I also remember that the teacher gave the key to the president and vice-president of the Student Council yesterday. Where did you get the key?" Ming Shu held her chin in her hands, smiling. "Or did you steal it?"
"No, no, I didn't steal the key," the student denied unconsciously.
When someone was blamed for stealing, they would reply instinctively if they didn't do it. The same went for this student. But she regretted it as soon as she retorted. "Yes, I stole it."
