The Script I Got as Cannon Fodder Was Magically Altered

[Almighty female protagonist × Loyal dog male protagonist] Once you become a person in the book, you will fill in any pitfalls. Chi Mu originally wanted to be a passerby who was just waiting to die, but the system suddenly opened his mouth - the plot collapsed, the female supporting actor died, you go and stand up for it. So Chi Mu took the script of a vicious female supporting character and specialized in green tea for a hundred years. From then on, integrity was a passerby. After finally getting along well with the character of the female supporting character, bad news comes from the system - the plot has collapsed, the female protagonist is dead, you go and support it. So Chi Mu bit the bullet and picked up the heroine's script. Ah fall! This plot is broken, why does it always not follow the script?