Indifference

2057. As the world teetered on the brink of destruction due to various monsters that suddenly appeared, the divine spirits protecting Korea awakened and bestowed power upon humans with shamanistic potential. They gained the ability to wield powers akin to superpowers seen only in comics. Telekinesis, healing arts, and more... People began to call those who received the spirits' power 'shamans,' and the government established the Shaman Association to manage them.

Shamans are broadly divided into three types.
First are the Exorcists. Exorcists can physically defeat monsters. They strike down monsters with various specialized weapons and send them to special prisons created by the Shaman Association.
Second are the Diviners. Diviners are inherently frail. However, they possess a very powerful ability: foresight. Since they can see the future, they are the Shaman Association's top priority for protection.
Third are the Mediums. Mediums specialize in appeasing the spirits of monsters and helping them find peace. This allows for the minimization of unnecessary combat. However, they are quite rare, so the Shaman Association periodically searches for them.

Monsters have ranks.
From the highest EX rank to the lowest F rank.
The order is EX -> SSS -> SS -> S -> A -> B -> C -> D -> E -> F.
For EX rank, you should think of it as needing to run away immediately upon encountering one.
F rank monsters can even be persuaded by Exorcists to find peace.
Furthermore, as a result of research by the Shaman Association, monsters are not inherently monsters from the start. They were originally humans who gradually transform into monsters for some reason. Representative examples include loneliness, solitude, and so on.