Lying on the ground is actually the body of a male teacher who was killed by Sanyuan. She put on a wig and clothes and attacked the garden in the dark to dispel her doubts.
She is Minako's teacher.
Revenge for Minako. When Minako learned that two male teachers in the school were engaged in illegal admission transactions, she told the head teacher Sanyuan the secret, but she was soon killed by two male teachers who pretended to commit suicide. The three principles of knowing the truth began her revenge with guilt and love for her students. ...