I Shorted the Treasury in Ancient Times

When an expert who is proficient in financial warfare traveled through time and became the concubine of a prince's family who was about to be confiscated, he decided not to climb the technological tree, but to establish the "Red Mansion" bank, using modern financial means of issuing national bonds and operating futures, to launch an ultimate business war of revenge and subversion against the "Tongtenkaku Tower" that controlled the economic lifeline of the empire.