Those Years When I Got the Wrong Script

I knew my identity and future right after I was born: I am a miserable cannon fodder female supporting character who has a deep crush on the male protagonist. But he only loves the heroine. As an excellent cannon fodder, I died to save the hero in the end, and the hero and heroine lived happily together. Hello, you have bound the protagonist's halo system Counterattack heroine 1%...30%...45%...