Dress up as a Villain: Recharge the School Beauty with One Million at the Beginning

As soon as I opened my eyes, I became the brainless villain in the harem novel who couldn't survive more than three chapters. Just as he is preparing to run away, [Shenhao Dungeon System] is activated! "Can you upgrade by spending money on a poor school beauty?" "Have close contact with a school beauty and double your experience points?" "Can the skills you receive through upgrading be enough to defeat the original male protagonist?" "By clearing the final dungeon, can you return to reality with a harem and hundreds of billions of assets?" Is there such a good thing? Former male protagonist, I'm sorry, your opportunities and your harem are now my props to pass the game! From today on, I am the only rule in this world!