Weird Safe House: I became stronger after taking in my roommate!

In this era of bizarre invasion, a safe house and a bed are all you need to raise your spiritual fire. You can use the spiritual fire to upgrade your spiritual gate, build arrow towers, and defend against ghosts! Shen Xu is trapped in a ghost realm, but luckily he managed to snag a safe house and awaken a system. He can become stronger by taking in roommates!