Porter of the Two Worlds in the Apocalypse

Qin Feng, an ordinary college student, accidentally obtained a tiger head token and became a "porter between two worlds" who could travel back and forth between the modern city and the apocalyptic wasteland. When others were struggling to survive in the apocalypse, Qin Feng exchanged compressed biscuits for gold, used Lao Ganma to win people's hearts, and armed his "Dawn" mercenary group with tons of arms. The left hand has lightning powers, and the right hand has inter-dimensional trade. Let's see how Qin Feng uses modern technology and business acumen to establish his own steel order in this collapsed world and write an alternative legend.