In a world where your phobias define you, your fears are based on how you died in your past life.

Chaeyeon is a psychiatrist with philophobia, the fear of love.

Daehyun is a residential doctor with thantophobia, the fear of death.

There aren't many in the world like these two, but when their lives crash at Samsung Medical Center, their nightmares only get worse. Little do they know, the cure to their horrors is each other.