Yang Gao somehow got bound to an unreliable System, which also demanded that he transmigrate to different worlds and complete missions.
But he discovered that every mission ended in failure, and each failure led the protagonist to a bad ending.
So his goal changed from saving the world to saving the protagonist.
To save the idiot Yang Gao, the System did everything it could to destroy the world every time.
Ugh, I'm tired of loving.
Theme: Keep your eyes open and see through scumbags!