Crime Scene Episode 3

In a high school in the UK, at 8:20 pm, a student is found dead in an art room after school. The victim died from temporal trauma, and the estimated time of death is 7:20-8:20 pm, and the victim's top is covered with blue paint. Five students and a teacher were on the suspect line, such as the students who remained for self-study and the teacher that was on duty. (Source: namu.wiki)