City: Interstellar Engineer Beats up Sales Department

I traveled through time and became Lin An, a good-for-nothing in the sales department. Zhao Dezhu spat in my face and scolded me for being the worst in performance. After finishing changing the rubbish plan he wrote in three minutes, the technical director of Tianhai Heavy Industry came out to pick it up in person. I am the reincarnation of the master of interstellar machinery - let this city know that even useless people can turn the sky upside down!