[Cthulhu + back room + cultivating immortals + golden finger + two male protagonists]
The protagonist is forced to get stuck in the back room, awakens the back room cultivation system, and begins the path to immortality;
He keeps growing up while being scared, and he meets a good brother while exploring;
With the continuous help of the system, the protagonist traverses the back room and kills the entities until they lose their armor;
But I discovered in the end that no sponsorship is free.
I ate it reluctantly