Doomsday RV: Survival in a Small World

My name is Su Wen. When the apocalypse comes, you gave me an RV in advance? Oh my god, a world was born inside this RV! Then you don't need to collect more supplies and become a superman to save the common people! No, why am I entangled by so many forces? What do you want to do? I have a system! Well! Don't just kowtow when you come up! I can't beat the mutant opposite right now! You fight it first! Wait for me to lie on the ground and recover for a while...