The Male Leads Are All Playthings of the Beautiful Female Side Characters

[Quick transmigration + female top + irresistible charm + brooding yandere + training dogs in a confinement room] After an unexpected incident, Ci Yi became bound to a supporting-character System. She had her own role-playing rules: 1. You are a nobody, a background extra in the protagonists' story, someone lost in the crowd. 2. Completing your mission is the only way to exit safely. 3. You have a secret that must never be revealed to outsiders. [Shh. Keep your secret hidden. Don't let anyone find out, or things will spiral out of control.] She thought she was an invisible blade of grass. But fate always seemed to give her strange traits. In the real world, a beauty so dazzling and uncanny it defied belief; in the beastfolk world, the last surviving S-rank Guide; in the apocalypse, a saint with the power to purify; at the aristocratic academy, a dragon of the highest order who entered people's dreams... She tried to hide, to keep up her disguise. But as the wheels of fate turned, there was no escaping what was meant for her.