《求救信号：紧急时刻的自救指南》谁能一口吃掉巨齿鲨

　　There is a fire in the classroom. There were two students in that burning classroom. 　　One died and one was taken to the hospital unconscious. Some say it was suicide and some say it was murder. Detective Eun-seob is staking out while the student is dying before he gets called in on the site. He witnesses the most terrible thing there.