The Strange Tomb-Raiding Puzzle

My name is Qin Chuan, and I'm descended from a Northern School tomb-robbing family. You can't make it in this line of work without a few tricks and a selfish streak. In this day and age, everyone pulls out all the stops for profit. My ancestors had dealings with the supernatural, and my grandfather served in the Eighth Route Army, leaving behind some mysterious things. With my family's inherited tomb-robbing techniques and my talent for appraising antiques, I've made a modest name for myself in these circles. Lin Xi, an archaeology major, is always trying to find clues to treasure in historical documents. We met while exploring an old mansion, a mysterious and dangerous place concealing countless secrets. That was where our story began.