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Li Shimin had mixed feelings. He recognized his son and gave him a title, but he didn't like to see him. He felt that the boy's origins were unknown and he was glib. Throw it into a corner of the palace to fend for itself. The protagonist starts off poor, being looked down upon by eunuchs and maids, and mocked by other princes as "bastards" and "bumpkins." The protagonist uses modern knowledge to make a small counterattack: make something delicious to please a certain manager, use some tricks to punish the unruly slaves, earn a little money, and initially gain a foothold.

The earth is in the end of the Dharma era when spiritual energy is exhausted. The protagonist accidentally becomes the sole successor of the ancient inheritance "Guide to All Realms", which can connect and extradite "visitors" or "crises" from all worlds (different dimensional worlds such as cultivation, magic, Cthulhu, science fiction, etc.) To the earth. His mission is to lead the human race on earth to survive and rise in the chaotic era of spiritual energy recovery in the game between various forces.