In the future world, there are "unknown entities" that harm the human spirit. They infinitely amplify human emotions and cause humans to cancel themselves. However, they still give humans hope to survive. They select brave men to accept challenges through dreams. If you don't have the ability to bear the name of brave, then there is no need to live. Even if you want to survive, you must succeed in the challenge! Even though Xi Hong and Bai Saki didn't like each other at the beginning of the challenge, they developed feelings during the difficult challenge.
Purpose: Face the darkest places in your heart, overcome them, and make peace with your past self.