Solomon's Perjury (2016)

On Christmas night, a student dies after falling from the school rooftop, and the police rule it a suicide. Days later, Seo Yeon, a classmate, receives a witness statement claiming it was murder. As the school and authorities focus on closing the case, ignoring the truth, Seo Yeon and her friends organize a school trial. Acting as judges, jurors, and lawyers, the students uncover dark secrets about the case and expose the hypocrisy of the adults around them. (Source: MyDramaList)