Quick Transmigration: The Universally Hated One Was Locked Up Until They Cried

[Bad Seed, Yandere Male Lead / Love at First Sight / All Male Leads Are Virgins / 1VN / Includes Imprisonment / Melodramatic Mary Sue] Qiao Wan has nothing but beauty and a selfish streak when she gets bound to a System and transmigrates into the body of a universally hated cannon-fodder character. She diligently follows the plot and makes life difficult for the male and female leads. So why have all the male leads turned dark?