Sign-In System: King of Express Delivery

I was squatting next to the express truck, eating cold buns, and a line of red words suddenly popped up on my phone: "Successfully signed in today - got a magical rejuvenation (2 remaining times)." My mother's critical illness notice was still in my pocket, and Xiao Wang Dazhu patted me on the shoulder: "Brothers, hold on, you go to the hospital first!" Zhao Tianhao's sarcasm rang in my ears: "Is it enough to treat a terminal illness if you spend your whole life with express delivery?" But when I inserted the silver needle into the back of my mother's neck, the heartbeat monitor in the monitor suddenly beat wildly - three rounds of physical strength, three times against the sky. From the courier who was trampled in the mud to the "King of Express Delivery" who holds the business empire, I want to dig out the secrets hidden in this broken system one by one.