Fantasy: I Actually Became the Protagonist's Younger Brother?

Ling Yuan was extremely excited when he first traveled through the fantasy world, but gradually he stopped laughing. Isn't this a novel I've read? He actually traveled through time and became the protagonist's younger brother. That's because the protagonist's brother's parents died, he died tragically for the protagonist, and his sister was taken into the harem by the protagonist. Lingyuan, who has read the novel, said that I was very panicked. Fortunately, there is a system for finding the protagonist. Since I can't follow the protagonist, then I will be the villain!!! The characters and plots in this novel are purely fictitious. Any similarities are purely coincidental and should not be imitated. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.