Double Boundary Monument

My name is Ye Xu, a martial arts loser who is working as cannon fodder in the north. But I have a secret: I can go back more than ten years and see with my own eyes how this battle was fought. I met an older brother in the past. He took me to travel to five countries and told me how precious peace is. I regard him as a confidant and a role model. I work hard to grow up and want to work with him to prevent future tragedies. It wasn't until later that I saw in history books: My glorious elder brother was the first and only initiator of this war sweeping the world. Now, I hold the knife and stand at the fork in time and space. On one side is the reality of mountains of corpses and seas of blood, and on the other side is the past woven with lies. Do you believe in the cold history, or do you believe in the eyes that once took me to see the mountains, rivers, lakes and seas and taught me what it means to protect? I must go back to where it all started and find out the tampered truth... Even if the opponent is time itself.