The End of the World: I Have a Safe House System

The day before the end of the world, a safe house system bound me and told me, "When the end of the world comes, hurry up and prepare the materials. I will build you a super invincible safe house." A certain boy who was confused was even more confused. System? The end of the world? Safe house? Is the world crazy or am I crazy? "Host! Don't be stunned! Hurry up and prepare the materials!" ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? Something doesn't seem right about this system? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.