There is a mysterious space called "Shadow Realm". It builds countless "trial fields" based on various movies and legends in human civilization, and forces "participants" from different time and space to enter it to complete tasks. The rules of the Shadow Realm are cruel and ruthless. Failure in a mission often means death. Completing a mission can obtain "Shadow Energy", which can be used to strengthen oneself and redeem skills or props. It is rumored that those who can finally control the Shadow Realm can realize any wish, but no one knows the true purpose and creator of the Shadow Realm.
