The homeroom teacher called me to my feet while I was slumped over the corner of my desk. Su Wan was beside me, pulling faces and calling out "Yali." I glanced at the half-open empty wooden box on my desk. The moment an image of a shadow darting into my eyes flashed through my mind, the System lit up. Before I could figure out where the clues to Gutongjing were leading, someone pushed open the classroom's back door from outside. Behind the school administrator standing in the doorway was a young man bundled up in a windbreaker. He was looking down at his phone, whose lit screen showed my face.
