I Guarded the Bronze Gate for Ten Years, Then My Sister Exposed Me on Livestream

My name is Zhang Yan, and I'm a transmigrator. With the help of a System, I became the youngest archaeology PhD in history. I thought this world was perfectly normal, until the day I discovered a clue about the Bronze Gate. So I left my younger sister a letter and my savings, then set out to find the Bronze Gate. Unexpectedly, I ran into a space-time turbulence. My name is Zhang Ya. My brother left a letter several years ago and then vanished without a trace. I've spent years searching for him. I even asked the whole internet to help find clues during my livestreams, but I still haven't found any news of him. Then, during a visit to our hometown, I accidentally found an old videotape and a Ghost Seal in my brother's room. To my surprise, the tape recorded my brother's entanglements with the Nine Gates. From the Lu Palace to the Heavenly Palace in the Clouds, my brother appeared in adventures that should have involved only three people. He even ended up taking Little Brother's place, entering the Bronze Gate to guard the Ultimate. The viewers who witnessed it all in the livestream went wild. : The trio from The Grave Robbers' Chronicles, no, wait, it's a quartet! They really existed! : Holy crap, streamer, who is your brother? Even Little Brother calls him Uncle Yan? : No, no, this can't be right! The timeline doesn't match!