A Dragon Imprisoned in the Abyss: I Am Heaven’s Chosen One

A modern-day overworked office drone unexpectedly transmigrates into the deposed crown prince, the last emperor of the Dayong dynasty. In the deserted palace, he is given nothing but cold leftovers, while a cup of poisoned wine is already on its way from outside. Clutching his knowledge of the dynasty's downfall from his past life, he uses his political skills to secretly recruit loyalists and turn the court officials against one another. First he averts a palace coup, then quells a warlord rebellion, and finally drives out foreign invaders and stabilizes the realm. From a discarded prince everyone could bully, he steadily ascends to the throne and becomes the new emperor who restores the kingdom.