Modern emergency drill designer Shen Yan travels into the "forbidden sea" fictional dynasty and wakes up in the accounting room of escaped slaves. He discovers a huge scam that manipulates the tide oracle and annexes salt, iron and military power. He can only help the cold-faced female owner rebuild the business while making overturns among the temple, the inner court, pirates and the military government, and finally rewrites the shipping route and national destiny of the entire dynasty from a small accounting room.
