I, Yun Sheng, Am a Supporting Character?

I have a share in the army of time-travelers. I am Ling Yu. I have a system that doesn't care about anything except giving me talent and understanding. Oh, no, it can still chat with me (annoys me). I thought I was the protagonist, but it told me I was a supporting role? I have to agree to one condition of his practice, and I use my little brain to think that I am also protecting the protagonist. So why doesn't it directly help the protagonist? I am not a supporting role for anyone, I am Ling Yu, I am who I am. After three thousand years of waiting for the protagonist, I will be a cloud saint. Why hasn't the protagonist come yet? If it doesn't come again, give me the task and I will save the world. ... What, dog system, you told me this is the protagonist? Why should he?