A sensational news headline, 'The Engineering College Serpent Suicide Case.' Followed by a suicide video on YouTube. The protagonist is Kim Seoyeon, who worked as a teaching assistant in the engineering department. One day, at the department's year-end party, Seoyeon is offered a teaching assistant position by her senior, Yoon Jeongwook. Due to her poor financial situation and failing all her job applications, Seoyeon considers pursuing graduate studies after hearing about the academic scholarship and research funding from Jeongwook. However, it turns out Jeongwook had passed on the teaching assistant position to Seoyeon due to unbearable mistreatment from Professor Kim Sangheon, and Jeongwook is no longer there when Seoyeon enters graduate school. With research and thesis forgotten, Seoyeon suffers mistreatment, such as having to queue for idol concert tickets for Professor Kim's daughter, and even reading navigation for Professor Kim to drive comfortably. After falling asleep in Professor Kim's car, Seoyeon is sexually harassed. Professor Kim justifies his actions by mentioning student loans and employment to Seoyeon, who rejects him. Unable to escape, Seoyeon is eventually sexually assaulted in Professor Kim's lab. Seoyeon seeks help from her senior, Mo Gyuwon, who is pursuing a doctorate, but Gyuwon ignores her, fearing retaliation. Jeongwook also doesn't answer her calls. Left alone, Seoyeon heads to the school rooftop after conveying her final words on the Facebook page 'Bamboo Forest'.