The first dark-type training text of "Walking Through Hell's Falling" breaks a process of being forced to enter carefully!!! A soul is falling, and an emotion is falling, and a teacher and slave. Who changed who? Who is conquering who? The second anti-type training text of "Walking Through Hell's Rebirth" is a slave for three years. How can Yu, who has been reborn with the help of his lover? It is not just memory that is buried, but also reborn is not only the doctors and patients who are redeeming whom? Who is healing whom?