Jiang Yu is a supporting female character, a key female supporting character at the genius level in this world.
Once he made a mistake, his luck was taken away by the ambitious heroine and he was tortured and killed.
When she was dying, Jiang Yu was bound to the counterattack system of a female supporting character, and began a journey across various sub-worlds to steal the heroine's luck and kill the heroine.
Note: 1v1, multiple worlds are one person.