Be the Heir While Fighting Zombies at the Same Time

When the zombies break out, he travels through time and becomes the heir. He spends six days a week as the heir and fights zombies one day. The palace he lived in was about the same size as the royal palace, and the zombies he fought were overwhelming. "While the zombies were still putting on their shoes, Captain Mojin, who ransacked the houses, had already traveled half of the capital to visit them." (Nothing like ransacking homes will happen.)