Li Yuan is an old monster who's lost count of how long he's been alive. One day, he picks up a System. Bored enough to want to destroy the world, he happily sets off on a transmigration journey. System 113 is one of the earliest Systems ever made, but it has never been bound to a Host. One day, the Main System finally throws it out, and it successfully lands on a Host. It thinks it has found itself a sweet, naive old geezer, but who knew the old geezer would turn out to be a deranged, evil snake of a Demon Lord? The Demon Lord may have an incredible mission completion rate, but! Let it out of the little black room already!!!! The person who gets pushed around in every world: ...
Major revisions underway.
Theme: Someone will always come for you.