Chen Yuan, a celebrated teacher at Mingde High School, is embroiled in a sexual harassment scandal. Unable to withstand the relentless public condemnation, he jumps from a building to prove his innocence, and his suicide note becomes “conclusive evidence.” Top student Shen Xingchen, presenting herself as the victim, sparks a nationwide wave of support, while the century-old school hastily disowns Chen. Lawyer Lin Wei takes on this “open-and-shut case” and exposes doubts about hidden cameras and a web of clues involving drugs. Amid threats from those behind an old case and the silence of witnesses, she gradually uncovers the “Cicada Shedding Project.” When Lin Wei reveals her identity in court as “Lin Jing, a student from a poor family,” the story of how Chen Yuan paid her tuition ignites the final confrontation. A bloody truth becomes a faint light protecting the classroom from the cruel edge of human nature.