System: I Want to Catch up on My Homework at the End of the Day

After Mu Jingyu was reborn, he was bound to an operating system. He discovered that he was just cannon fodder for Doomsday Man, and the male protagonist was someone else. While others were hoarding supplies, he was catching up on homework. While others were killing zombies, he was still doing his homework. While others chose to lie down, he was still doing his homework. His homework is to brush up on proficiency, various proficiencies. It's hard to build a system, but you still have to work for the system. Choose to hug your thighs! The male protagonist's thighs are not easy to hold, so he has to take half of the supplies. After finally defeating a zombie, I still need to have 10 rings on the spot. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.