Aren't You a Passerby as a Supporting Actor? Why Did She Become the Heroine!

[Two male protagonists + Xiong Jing Shura Field + All members have single arrows + No CP in the text + Steel Straight Man] Jiang Yi accidentally learned that he was the male supporting character in an ancient book about the overlord. And his sister was a vicious female supporting character and died three years later. Before he could be shocked, even more explosive news came! The heroine of the original book escaped and the world collapsed, so the system found him and asked him to play the heroine. Jiang Yisui saw the tragic death of his sister at the end of the plot and resolutely agreed. But who can tell him! Why doesn't the male protagonist follow the script? Also, you three, don't cause trouble for me!