Siheyuan: I Chose Science and Engineering

When I was reborn, I was faced with the choice between liberal arts, science and engineering. I crossed out liberal arts and medicine and chose science and engineering. The whole hospital laughed at me for leaving the iron rice bowl unruly. I touched the interlayer at the bottom of the pen holder. There was half an old drawing and a copper key pressed inside. Said there were three copper bars buried under the floor tiles in the old workshop.