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The story takes place in a world that is constantly war-torn. There are only two major cities in this world - Fenyang and Dukou. Legend has it that the god was born in Fenyang and emerged from the ferry. After his birth, the world was no longer peaceful. Fenyang advocates force and is eyeing the ferry. But there is an unnamed mountain between the two cities that is difficult to cross. There is a beast named "Qi" in the mountain, which blocks the passing army. Legend has it that the god stayed behind to ensure peace between the two sides, so the march of Fenyang's army became very difficult. As a result, a large number of assassins were cultivated, which were later named the Assassin Group. However, hundreds of years later, the Assassin Group became independent and became an underground organization called "Grey" with a neutral attitude. The story begins here.