Villain Demon King: Sign in at the Beginning and Betray the Enemy System

The reborn cannon fodder senior brother awakens the traitor system. I defected to the Demon Cult, but was thought to be an eternal chess player by everyone in the world. I wanted to be ruthless and loveless, but the system forced me to open the Crystal Palace! The cool sword fairy, the enchanting demon king, the imperial princess... When they were jealous of me, I discovered that my identity as a scumbag seemed to have been imagined by them into an eternal plan?