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Tetsuo Nagai is a probation officer. His job is to rehabilitate young offenders and get them on the straight and narrow. Married with one son, he lives a happy life. All that changes one day when his wife is murdered...

The great adventures of life and human connections in contemporary Korean society, following a formal baseball player, a sleepless student, a new hangman, an imprisoned gangster, and a mysterious father and daughter.

One day, a teacher by the name of Izumi is found stabbed to death in her wedding dress in the pool on the rooftop of Seishun High School. A classmate confesses to being her killer to Class 3C’s president Hibino Meina and Goshima, the detective in charge of the case. However, Meina detects inconsistencies in the incomprehensible method and motive for murder and has to refute the person, only for another classmate to step forward to confess. Why would her classmates claim to be the criminal?