The Transmigrate-Into-a-Book Side Character Is a Drama Queen [Quick Transmigration]

Aibibi originally thought that the daily life of transmigrating into a book meant every male lead would fall in love with her. The truth, however, was cruel. Ever since she got bound to an idiotic System that refused to reveal its name, this was how her life went: Aibibi: "Waaah, this is so hard. Why doesn't any male lead love me? Aren't I the heroine?" System: "Wake up, Host! You're just a supporting female character." Aibibi: "..." Or like this: Aibibi: "I think if I try a little harder, I can win this male lead over and take the heroine's place." System: "No. Host, please follow the original plot." Aibibi: "..." Or perhaps like this: Aibibi: "Why did I transmigrate here in the first place?" System: "Because all the original supporting female characters ran off in frustration." Aibibi: "So my purpose is to be dragged out as a human shield by male leads like CEOs, superstars, rich heirs, and Shanxi coal bosses, then watch them live happily ever after with their beloved first loves?" System: "Bingo." Aibibi: "..." What a life, with so much I want to say but shouldn't. Aibibi: You expect me to have the heroine's background but follow the supporting character's plot? Not a chance. System: I don't know why, but I feel a chill down my back. Theme: